Used Meconaf Extraction Unit for sale (31,716)

Condition: used, Year of construction: 2009, Extraction unit filter cabinet Brand/Type: FAPP AE 12/3J Equipped with 1 used filter cartridge See our other advertisements Bsdpjxc Erhjfx Ad Ajdb VMA Wekerom

Condition: good (used), Painting booth with suction device and cabinet Article: Spray booth with extraction unit and cabinet Dimensions spray booth: 72 cm wide, 60 cm deep and 80 cm high Cabinet dimensions: 72 cm wide, 109 cm deep and 100 cm high Number of drawers: 6 Bsdpfsg I Dhgex Ad Aedb Colours: green and black Condition: used  Complete factory locker, large selection of storage platforms, pallet racks, shelf racks, paternosters. High quality industrial machines, lathes, grinding machines, hand machines Further articles - new and used - you will find in our shop! International shipping costs on request!

Condition: used, power: 1.1 kW (1.50 HP), input voltage: 380 V, volume flow: 2,000 m³/h, intake manifold diameter: 140 mm, filter area: 1.65 m², total height: 1,900 mm, total length: 1,100 mm, total width: 650 mm, overall weight: 50 kg, extraction connection diameter: 140 mm, nominal flow rate: 2,000 m³/h, negative pressure: 1,800 Pa, nominal power: 1.1 kW (1.50 HP), space requirement height: 1,900 mm, space requirement length: 1,100 mm, space requirement width: 650 mm, transport length: 1,100 mm, transport width: 650 mm, transport height: 1,900 mm, No. 3258 Mobile extraction unit / mobile dust extractor Scheppach HA 3200 Used For extracting wood shavings, milling chips, sawdust and sanding dust Motor 1.1 kW, 380 V Air output 2000 m3/h Pressure difference max. 1800 Pa Extraction connection diameter 140 mm Impeller diameter 320 mm Special filter diameter 500 mm, height 800 mm Filter surface 1.65 m2 Extraction unit mobile with 2 swivel castors Transport dimensions approx. 1100 x 650 x 1900 mm LWH Weight approx. 50 kg Bdodox Hi Rxspfx Ad Aeb Sale on behalf of customer, ex location near 73430 Aalen, without dismantling, without transport and assembly Dismantling, loading and transport by us optionally possible Subject to errors in the description and price To avoid possible misunderstandings, an on-site inspection is possible and recommended by appointment Sold as is Technical specifications, condition description, year of construction and scope of delivery according to manufacturer's brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Pictures and videos serve as examples and do not represent the actual scope of delivery Terms of payment: Prices plus VAT, payment before collection or shipment Terms of delivery: ex location

Condition: used, power: 1.1 kW (1.50 HP), volume flow: 2,000 m³/h, intake manifold diameter: 140 mm, filter area: 1.65 m², total height: 1,900 mm, total length: 1,100 mm, total width: 650 mm, overall weight: 50 kg, extraction connection diameter: 140 mm, nominal flow rate: 2,000 m³/h, negative pressure: 1,800 Pa, nominal power: 1.1 kW (1.50 HP), space requirement height: 1,900 mm, space requirement length: 1,100 mm, space requirement width: 650 mm, transport length: 1,100 mm, transport width: 650 mm, transport height: 1,900 mm, No. 3257 Mobile extraction unit / mobile dust extractor Scheppach HA 3200 Used For extracting wood shavings, milling chips, sawdust and sanding dust Motor 1.1 kW, 380 V Air output 2000 m3/h Pressure difference max. 1800 Pa Extraction connection diameter 140 mm Impeller diameter 320 mm Special filter diameter 500 mm, height 800 mm Filter surface 1.65 m2 Extraction unit mobile with 2 swivel castors Transport dimensions approx. 1100 x 650 x 1900 mm LWH Weight approx. 50 kg Sale on behalf of customer, ex location near 73430 Aalen, without dismantling, without transport and assembly Bjdpfxjx Hi H Hs Ad Asdb Dismantling, loading and transport by us optionally possible Subject to errors in the description and price To avoid possible misunderstandings, an on-site inspection is possible and recommended by appointment Sold as is Technical specifications, condition description, year of construction and scope of delivery according to manufacturer's brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Pictures and videos serve as examples and do not represent the actual scope of delivery Terms of payment: Prices plus VAT, payment before collection or shipment Terms of delivery: ex location

Condition: used, Year of construction: 2014, filter area: 150 m², suction capacity: 15,000 m³/h, The WELDEX FT series of filtration towers has been specially designed for the efficient removal of welding fumes in production facilities. These units are primarily intended for extracting contaminated air during the welding of large or complex metal parts, where conventional fume extraction directly at the source is impractical. Fine particles are captured by M-class filter cartridges, and the filters are automatically cleaned during operation using a pulse jet of compressed air (pulse cleaning). The WELDEX FT filtration tower is positioned at the center of the workspace. Fume-laden ambient air is drawn in at the top of the unit from the surrounding area, filtered, and then returned to the hall draught-free through two side outlets. The three-section dust collection drawer gathers separated contaminants from both the pre-separator chamber and the filter compartment. Welding fume extraction for production halls (workplace ventilation systems) Ideal for all work areas where selective extraction is impractical: - Metal industry - Mechanical engineering - Automotive industry - Vehicle manufacturing - Aircraft construction - Shipbuilding - and many more High-performance welding fume extraction for manufacturing plants No need for ductwork installation Easy to install – ready for immediate use Durable, cleanable filter cartridges = low operating costs Efficient fume extraction using thermal lift from the welding process Compact design = minimal space required Flexible application = can be relocated at any time Bsdpfx Adoxg Ickj Ajdb Brand: ESTA Model: WELDEX FT-150 Specifications: Motor power: 11 kW Capacity: up to 15,000 m3/h Vacuum: 2,000 Pa Filter surface area: 150 m2 Weight: 1,400 kg Year of manufacture: 2014 Dimensions: Width: 2.10 m x 1.40 m Height: 3.65 m Stock no.: 1031

Condition: good (used), Year of construction: 2017, machine/vehicle number: 0371, Offer 25146 Technical Data: - Portable design suitable for CrNi steels - Air flow rate: approx. 200 m³/h - Max. negative pressure: 19,000 Pa - Filter surface area: approx. 0.8 m² - Filter separation efficiency: 99.9% - Extraction connection: 60 mm - Extraction hose: 6 m - EWM torch package, water-cooled with extraction function: 4 m Bdedpfxextapio Ad Asb - Automatic start-stop - Dust drawer - Drive – fan: 230 V / 1.1 kW - Space requirement: approx. W 650 x H 600 x D 250 mm - Weight: approx. 25 kg

Condition: good (used), Year of construction: 2017, machine/vehicle number: 0381, Offer 25147 Bdodpjxtatzofx Ad Asb Technical Data: - Portable design suitable for CrNi steels - Air flow rate approx. 200 m³/h - Max. negative pressure 19,000 Pa - Filter surface area approx. 0.8 m² - Filter separation efficiency 99.9 % - Extraction connection 60 mm - Extraction hose 5 m - Water-cooled torch package with extraction function 4 m - Start-stop automatic - Dust drawer - Drive - Fan: 230 V / 1.1 kW - Required space approx. W 650 x H 600 x D 250 mm - Weight approx. 25 kg

Condition: good (used), Year of construction: 1993, Offer 24299 Technical data: - Volume flow approx. 2170 m³/h. - Dust bag / chip bag up to 170 L - Connection spigot 160 mm - Connection spigot adapter 2 x 100 mm - Drive power 400 V / 2.2 kW - Space requirement W 1200 x H 1900 x D 550 mm - Weight approx. 85 kg Bodpfot Hurxjx Ad Asdb

Condition: excellent (used), Year of construction: 2022, functionality: fully functional, power: 11 kW (14.96 HP), volume flow: 8,000 m³/h, nominal flow rate: 6,950 m³/h, negative pressure: 2,630 Pa, H 3 "GS dust-tested" Extraction connection 350 mm Ø Pneumatic JET filter cleaning Extinguishing system with powder extinguisher Bdjdpfx Adswty Uze Aeb With rotary air lock

Condition: used, No. 04491 Mobile extraction unit / Mobile dust extractor ESTA Dustomat HMS 10 WN Used For extracting wood dust and chips Filter type H2 for wood dust, residual dust content level 2, 0.2 mg/m3 Type 1, for extracting combustible dusts of dust explosion classes St 1 and St 2 400 V, 1.1 kW, with power cable and plug Nominal air volume flow 720 m3/h Bdedsxnqauopfx Ad Aeb Filter area 3.5 m2 Extraction pipe connection diameter 100 mm Filter cleaning by hand crank Chip container 670 x 460 mm Mobile unit CE-compliant Transport dimensions approx. 1300 x 550 x 1700 mm LWH Weight approx. 100 kg To avoid possible misunderstandings, an on-site inspection is possible and recommended by appointment Sold as is Technical details, condition description, year of construction and scope of delivery according to manufacturer's brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Terms of payment: Prices excl. VAT, payment before collection or dispatch Terms of delivery: ex warehouse

Condition: used, No. 04490 Mobile extraction unit / Mobile dust extractor ESTA Dustomat 10 Used For extracting wood dust and chips Filter type H2 for wood dust, residual dust content level 2, 0.2 mg/m3 Type 1, for extracting combustible dusts of dust explosion classes St 1 and St 2 400 V, 1.1 kW, with power cable and plug Nominal air volume flow 720 m3/h Filter area 3.5 m2 Extraction pipe connection diameter 100 mm Bdodpfx Asxn Tiljd Asb Filter cleaning by hand crank Chip container 670 x 460 mm Mobile unit CE-compliant Transport dimensions approx. 1300 x 600 x 1700 mm LWH Weight approx. 100 kg To avoid possible misunderstandings, an on-site inspection is possible and recommended by appointment Sold as is Technical details, condition description, year of construction and scope of delivery according to manufacturer's brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Terms of payment: Prices excl. VAT, payment before collection or dispatch Terms of delivery: ex warehouse

Condition: used, No. 04489 Mobile extraction unit / Mobile dust extractor ESTA Dustomat 61 Bodpexnprcjfx Ad Asdb Used For extracting wood dust and chips Filter type H2 for wood dust, residual dust content level 2, 0.2 mg/m3 Type 1, for extracting combustible dusts in zone 22 400 V, 3 kW, with power cable and plug Nominal air volume flow 1850 m3/h Extraction pipe connection diameter 160 mm Filter surface area 9.6 m2 Filter cleaning by hand crank Filter dimensions approx. 720 x 510 mm Chip container 860 x 570 mm Mobile unit CE-compliant Including new replacement filter Operating instructions available Transport dimensions approx. 1700 x 800 x 2100 mm LWH Weight approx. 250 kg To avoid possible misunderstandings, an on-site inspection is possible and recommended by appointment Sold as is Technical details, condition description, year of construction and scope of delivery according to manufacturer's brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Terms of payment: Prices excl. VAT, payment before collection or dispatch Terms of delivery: ex warehouse

Condition: used, Year of construction: 1997, Product: HÖCKER VACUMOBIL EA 250 Bdsdpsxbf Rbjfx Ad Aeb Motor: 5.5 kW Extraction capacity: 4200 m³/h Cylinder filter: 96 units (length: 1250 mm, diameter: 80 mm)

Year of construction: 2007, condition: as good as new (ex-display), machine/vehicle number: 31495, SOXHLET EXTRACTION UNIT -SEMI-AUTOMATIC RAYPA SX-6 System for extracting fats or solvents soluble in a solvent using methods Soxhlet and Randall. Compatible with a wide range of samples. Extraction system with solvents, according to Randall method for fat and soluble materials determination, in food, feeds, soils, detergents, polymers, paper pulp, fibres, rubbers, textiles, petrochemical products, pharmaceutical products, etc. Furniture in stainless steel, epoxy resin painted. Heating by an electric plate with an armoured heater to assure homogeneous distribution of heat. Control of temperature by a microprocessor with P.I.D. action and probe Pt100 class A. Bdodefiulfepfx Ad Aeb Over-temperature safety control by independent thermocouple. Vitón® seal set. In accordance with standardized international methods: AOAC, ISO, AACC. Advantages Independent programming of “boiling” extraction time and “rinsing” extraction time. Specifications Working range of temperatures: room temperature +5 ºC to 220 ºC. Solvent volume: up to 50 ml. Sample max. volume: 25 ml. Solvent recovery: 60-70%. Reproducibility: ±1%. Extraction cartridge Ø ext 26 × 60 mm. “boiling” extraction time: 0-99 h. “rinsing” extraction time: 0-99 h. Extraction speed: 30-60 min. Electric protection IP65. NOTE: Components supplied with our equipment: 18 extraction vessels + magnetic adapter. 3 racks for extraction cartridges. 3 racks for extraction vessels. Aligning rack. Box containing 25 thimbles. Documents: Instruction manual for use and maintenance in Romanian and English. Year of manufacture 2007, never used • For the Romanian companies there is the possibility of selling in instalments. Price Euro 2.650+ VAT Ex Works Loaded of FCA: Oradea/Romania Irrtum, Anderungen und Zwischenverkauf vorbehalten / Subject to errors, changes and prior sale / Ne rezervăm dreptul la greșeli, modificări și vânzare We speak English. /Wir sprechen Deutsch./ Beszélünk magyarul. /Nous parlons français/Vorbim romana

Condition: new, with compressed air cleaning and frequency converter Startup with frequency converter, Pressure transmitter for demand-based control Pre-separator integrated, Automatic fire extinguishing system integrated Efficient and economical: Large-capacity compressed air tank with fast-acting diaphragm valves for effective OPTI JET filter cleaning and minimal compressed air consumption. So simple and so effective: OPTI JET cleaning and filter bags with snap ring closure. Exceptionally economical: energy-efficient drives according to IE3 Safe in case of emergency: maintenance-friendly fire extinguishing system. Extremely quiet operation: sound-insulated air recirculation from AL-KO. All options available: PLC control for manual and automatic modes. Countless options from machine recognition to gate actuation to frequency-controlled operation, to name just three examples. Nothing left to chance: collection container with inspection window. Practical in every detail: container fastening with ergonomically shaped clamping lever. Expandable at any time: retrofit for discharge via briquetting press or rotary valve possible. Bdedpfxexpximj Ad Aeb - High extraction performance - Compact footprint - 100% air recirculation without temperature loss - (Residual dust < 0.1 mg/m³) - Integrated pre-separator and expandable control system - Optimal filter cleaning - Minimal noise level - Optional: patented fill level monitoring - Maintenance-friendly, certified automatic fire extinguishing system - Dust barrier for dust-free bin changes - (Optional: safety locking system for the containers) - Freely configurable module exchange and expandable ----- Technical Data ----- Extraction nozzle diameter: 350 mm, Nominal air flow rate: 6,927 m³/h, Maximum air flow rate: 8,500 m³/h, Maximum negative pressure: 2,543 Pa, Filter surface: 73 m², Chip collection volume: 3 x 250 liters, Number of bags: 3, Motor 400 V: 11.0 kW, Dimensions (LxWxH): 3,340 x 1,058 x 2,351 mm, Sound pressure level: 71 dB(A), Weight: 999 kg, according to: GS - HO - 07

Condition: new, with compressed air cleaning and frequency inverter Start-up with frequency inverter Pressure transmitter for demand-based control Pre-separator integrated Extinguishing system integrated Efficient and economical: Large-volume compressed air tank with fast-acting diaphragm valves for effective OPTI JET filter cleaning and minimal compressed air consumption. Simple yet effective: OPTI JET cleaning and bag filters with snap ring closure. Extremely efficient: Energy-efficient IE3-class drives. Safe in case of emergency: Service-friendly extinguishing system. Exceptionally quiet: sound-insulated air recirculation from AL-KO. All options available: PLC control for manual and automatic operation. Countless options, such as machine recognition, damper control, and frequency-controlled operation, to name just a few. No mess: Collection container with inspection viewing window. Practical down to the last detail: Container locking with ergonomically shaped clamping lever. Easy retrofitting: Can be converted for discharge via briquette press or rotary valve. - high extraction capacity - minimal space requirement - 100% air recirculation without temperature loss - (residual dust < 0.1 mg/m³) - integrated pre-separator and expandable control system - optimal filter cleaning - minimal noise level - optional: patented fill level monitoring - service-friendly, certified fire extinguishing system - dust barrier for dust-free container change - (optional: safety interlock for containers) - modules freely configurable and expandable Bdedpfx Adowzyh Ro Aob ----- Technical Data ----- Extraction nozzle Ø: 355 mm Nominal air flow: 7,127 m³/h Max. air flow: 10,000 m³/h Max. negative pressure: 3,347 Pa Filter area: 73 m² Chip collection volume: 3 x 250 liters Number of bags: 3 pcs Motor 400 V: 15.0 kW Dimensions (LxWxH): 3,320 x 1,058 x 2,361 mm Sound pressure level: 73 dB(A) Weight: 1,064 kg according to: GS - HO - 07

Condition: new, Integrated pre-separator Integrated automatic extinguishing system Efficient and economical: large-volume compressed air tank with with fast-switching diaphragm valves for effective OPTI JET filter cleaning and minimum compressed air consumption. So simple and so effective: OPTI JET cleaning and bag filter with bag filter with snap ring lock. Extremely economical: Energy-efficient drives in accordance with IE3 Safe in the event of an emergency: Maintenance-friendly automatic extinguishing system. Peace and quiet: the soundproofed air recirculation system from AL-KO. All options are open: PLC control for manual and automatic automatic operation. Countless options from machine detection to slide control to frequency-controlled operation operation, to name just three examples. Nothing goes wrong: Collecting container with inspection window. Practical down to the last detail: container lock with ergonomically ergonomically shaped clamping lever. Can be retrofitted: conversion to discharge via briquetting press briquetting press or rotary feeder possible. - High suction capacity - little space requirement - 100 % air recirculation without temperature loss - (residual dust < 0.1 mg/m³) Bdjdju R S A Repfx Ad Asb - Integrated pre-separator and expandable control unit - Optimum filter cleaning - Minimal noise level - Optional: patented fill level monitoring - Maintenance-friendly, certified automatic fire extinguishing system - Dust bulkhead for dust-free container change - (optional: safety interlocking of the containers) - Freely configurable module replacement and expansion options ----- Technical data ----- Extraction nozzle Ø: 300 mm, Nominal volume flow: 5,089 m³/h, max. volume flow: 6,000 m³/h, max. negative pressure: 2,587 Pa, Filter area: 30 m², Chip collection volume: 3 x 250 liters, Number of bags: 3 pieces, Motor 400 V: 7.5 kW, Dimensions (LxWxH): 3,000 x 1,058 x 2,361 mm, Sound pressure level: 71 dB(A), Weight: 838 kg, according to: GS - HO - 07 - new exhibition machine -

Condition: new, Year of construction: 2025, AL-KO POWER UNIT® 120 M with automatic machine recognition Clean air extraction system with H3 approval Suction connection: 120 mm Nominal motor power: 1.5 kW / 3 Ph Voltage: 400 V / 50 Hz Maximum volume flow: 1,140 m³ / h Nominal volume flow: 814 m³ / h Negative pressure: 2.180 Pa Filter area: 5,1 m² Chip collection volume: approx. 135 litres Dimensions (L x W x H) in mm: 1,178 x 650 x 1,972 Weight: approx. 121 kg Location: Ex stock 54634 Bitburg Bdodpfxshkztwj Ad Aeb - immediately available -

Condition: excellent (used), For sale: Professional automatic Vickers hardness tester Mitutoyo HV-100, made in Japan, in excellent technical and visual condition. The device is equipped with the AUTOVICK automatic measurement system and the Mitutoyo Vision Unit, enabling fast, repeatable and fully automatic hardness measurements without operator subjectivity. Intended for measurement laboratories, quality control departments, manufacturing plants, automotive, aerospace, and toolmaking sectors. —— Key information • Measurement method: Vickers (HV) • Model: HV-100 (series HV-100B / HV-100C / 100D) • Load range: up to 100 kgf • Automatic AUTOVICK system • Integrated Mitutoyo Vision Unit • Automatic impression recognition and HV calculation • Made in Japan Bdedpfxeyc H I Ss Ad Ajb • Power supply: 230 V • Stable, heavy-duty laboratory construction —— Technical condition • Device operational and complete • Very good visual condition • Regularly used in an industrial environment • Last technical inspection: 2020 • Ready for immediate operation after connection —— Included in the set • Mitutoyo HV-100 hardness tester • Vision Unit (measuring camera) • AUTOVICK automatic system • Set of weights • Original accessories and holders • Transport cases with equipment • Original Mitutoyo documentation and manuals • Weight: 65 kg

Condition: good (used), Drawer shelving, workshop drawer unit, tool cabinet Bdodpjy Ehkbsfx Ad Asb – 9 drawers – large format, approximately 117 x 104 cm inside the drawer – each drawer has its own bearing. Made in Germany

Condition: like new (used), Year of construction: 2022, Reda STERILDOSE aseptic dosing unit Can be used as aseptic doser for dosing of any components into milk, juice and other beverages products Capacity: 3000 l/h Bedpfeyil A Sox Ad Aodb New condition Dimensions LxWxH: 2650x1800x2230mm

Condition: excellent (used), I am offering a professional industrial extraction unit / industrial vacuum cleaner from the renowned German brand AL-KO, model POWER UNIT APU 100. This unit is designed for extracting dust and contaminants in an industrial environment – ideal for workshops, carpentries, and manufacturing plants. The equipment is in very good technical condition and ready for immediate use. ⚙️ Technical Specifications - Manufacturer: AL-KO (Germany) - Model: POWER UNIT APU 100 - Year of manufacture: 2021 - Power supply: 400V / 50Hz (3-phase) - Motor power: 1.5 kW - Airflow: approx. 865 m³/h - Negative pressure: 2124 Pa - Connection diameter: 100 mm - Speed: 2896 rpm - Protection class: IP54 - Weight: approx. 116 kg ✅ Technical Condition - Complete device - Fully functional, ready for operation - Very good visual condition - No mechanical damage - Used – normal signs of use 📦 Included in the set - AL-KO POWER UNIT APU 100 extraction unit - Complete set as shown in the photos Bdjdpfx Asyxtf Rod Asb - Documentation (user manual) 🏭 Typical Applications - Carpentry workshops and wood processing plants - Production and workshop environments - Dust and chip extraction - Dust extraction systems

Condition: new, Year of construction: 2026, -Smart Safety Clean Air Enhanced Efficiency. -Elevate your workplace safety with the TFON Airwet Series — a state-of-the-art wet-type air suction system engineered to eliminate sparks and dust produced during deburring processes. The Airwet Series significantly reduces the risk of fire and explosion, protecting both your workforce and your facility. -Fire & Explosion Prevention: Effectively minimizes hazardous particles and ignition sources right at the source. -Enhanced Air Quality: Captures and removes airborne contaminants, creating a cleaner and healthier work environment Bdsdpfx Aevg U Dxjd Asb Seamless Integration: Compact, space-saving design allows for easy installation into existing machinery and workflows. Increased Safety & Regulatory Compliance: Supports compliance with occupational health and safety standards, boosting overall operational safety

Condition: excellent (used), Year of construction: 2001, functionality: fully functional, bag dust filter Bag dust filter tower 4kw 9 bag extractor 3200m3/h 9 bag dust filter extractor in excellent condition for sale. radial fan: Filli ferrari 4kw 9 pieces of EMTEX textile dust filter bags, 250mm x 1650mm/pc Outlet diameter: 600mm Inlet diameter: 260mm Bodsydp Nuopfx Ad Aedb built-in vibratory shaker. 0.18kw. structure: galvanized steel casing, steel frame. height: 3800mm width: 1150mm

Condition: ready for operation (used), Year of construction: 2020, operating hours: 400 h, functionality: fully functional, machine/vehicle number: 200468, overall weight: 40 kg, total length: 560 mm, total width: 480 mm, total height: 450 mm, The device is used for the isolation and purification of nucleic acid from clinical samples and not only. The system is equipped with heating and UV disinfection functions. It can simultaneously perform isolation for 24 samples. It is characterized by a short extraction time and high extraction efficiency. The extraction process is fully automated, it uses the magnetic bead method. The device consists of mechanical parts (including a vibration module, a magnetic rod module, a magnetic sleeve module and an entrance and exit door module) and electrical parts (including a control module and a heating module). Bedpewnny Isfx Ad Asdb