Fume Hood General Design Requirements F . Service fixtures and fittings: Color-coded hose nozzle outlets and valves mounted inside the fume hood and controlled from the exterior with color- coded index handles (when specified). opening is closed and opened, the flow passing over the thermistor is calibrated to a face velocity that is displayed on the front of the monitor.
1. Safety monitor: UL listed, tamper proof, with all alarm circuits, electric components, external tubing, and manifolds furnished complete and factory installed. Monitor shall have light emitting diode display that provides clear indication of airflow conditions. 2. Calibration is the responsibility of the owner and is required once the hood is stationed and the hood exhausts and room supply systems are balanced. A secondary calibration has been factory set into the alarm’s memory only to determine that the alarm is functional and ready for shipment. The primary calibration must be completed in the field. 3. Airflow sensor: Thermally compensated glass beaded thermistor, factory connected to a sidewall port on the interior of the fume hood. 4. Alarm Signal: Audible signal and visual, red light emitting diode: a. Silence pushbutton, which disables the audible alarm, shall be accessible on the front of the safety monitor. b. Provide alternate mode in which visible alarm is silenced indefinitely but visual alarm remains activated until the alarm condition is corrected. c. When alarm condition is corrected and face velocity and volume return to specified levels, the Safety Monitor will automatically reset and begin routine monitoring. d. Provide test circuit to verify proper Safety Monitor operation. e. Electrical rating: Maximum 12 VDC, and maximum current rating of 20 OMA. f. Provide a option for a sash alarm / sensor if required.
1. Valves: Rod-driven needlepoint type with self-centering cone tip and seat of hardened stainless steel. 2. Provide pre-piping for all service fixtures from valve to common point for final connection by respective trades. 1/2” OD copper tubing for water, air, gas and vacuum. All type “L” copper connections & elbows are made with Vega ProPress fittings. 3. Fixtures exposed to hood interior: Brass with chemically resistant powder coating. 4. Remote control handles: Prong type, easy to grasp. 5. Services: To be determined by Architect/ Planner. G . Hood light fixtures: Two lamp, rapid start, LED UL listed light. 1. Interior of fixture: White, high reflecting plastic enamel. 2. Size of fixture: Largest possible up to 48” for hoods with superstructures up to six feet. Provide two 24” fixtures for hoods with eight foot superstructures. 3. Include lamps with fixtures. 4. Illumination: Per performance values, part 1 of this section. 5. Provide switch with black acid resistant thermoplastic (when specified). 6. 3-way switch on each side of double sided hoods (when specified). H . Electrical services: Provide on each front post of hoods. Three wire grounding type receptacles rated at 120v GFI, 20 amperes where specified. Flush Plates: Black acid resistant thermoplastic. I . Work surfaces: 1-1/4” thick dished a nominal 1/4” to contain spills. 1. Molded resin work surfaces for hoods with white Resisto Roe or Poly-resin liners. Front raised edge no more than 1/2” wide. J . Safety Monitor/Alarm System: Provide safety Monitor/Alarm system that monitors face velocity and provides audible and visual alarm if face velocity drops below safe levels. The technology used in the TEL 500 will be based on thermally compensated thermistor based in the alarm module. As the internal fume hood pressure changes as the sash
2.03 CEILING ENCLOSURE: Provide ceiling enclosure from top of hood to accommodate a ceiling height (verify). Fabricate enclosure from 18 gauge steel to match the hood material and finish. A. Preparation: Spray clean metal with a heated cleaner/ phosphate solution. B . Application: Electro statically apply powder coat of selected color and baked in controlled high temperature oven to assure a smooth, hard satin finish. Surfaces shall have a chemical resistant
Air Master Systems Corp. • 231.798.1111 • airmastersystems.com
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