PROCESS #9-1239 Rev 2 April/2021 Best Products. | Best Performance. | Best Protection. Page 9 of 11
NuAire, Inc. | 2100 Fernbrook Lane | Plymouth, MN 55447 | U.S.A | ph: 763.553.1270 | fx: 763.553.0459 | tf: 800.328.3352 |
16. Where required, all cabinets shall be provided with a separate support base constructed from ½-
inch polypropylene. Fume hood bases shall be constructed per the requirements for
polypropylene base cabinets, section 12350, except as specified herein.
Fume hood bases shall have 1½-inch diameter adjustable levelers that are accessible
from inside the base cabinet and protected from spills with a ½-inch high rim, covered
with a removable cap. A minimum of two (front and rear) levelers shall be provided for
each 2-foot section of fume hood. The levelers shall thread through a minimum of 1½-
inches of material for stability and permit an adjustment of 2-inches.
The top of the base cabinet shall have a 3-inch wide, full interior perimeter stretcher to
facilitate assembly to the hood.
Hood bases shall have at least one sealed compartment where sinks/cup sinks are
scheduled. The remaining space shall contain a fixed shelf. Where sinks are scheduled
on both sides of the workspace, each shall have a sealed compartment. Each sealed
compartment shall have an access panel for connection to building utilities. Depending
on hood size, any remaining space shall contain a fixed shelf.
All base cabinet doors shall have four 1½- inch diameter vent holes, centered 4-inches
above the bottom of the door and evenly spaced. An adjustable slide shall be located
on the inside of the door, with an identical offset hole-pattern to control airflow through
the compartment(s). For compartments with shelves, shelves shall permit air to pass
through the front ½-inch of the shelf.
17. There must be no use of nylon materials including nylon filled/mixed or any other combination
of nylon with other plastics. Miscellaneous tubing, valves, caps, etc. may be of other acceptable
(PVC, TFE, PVDF, vinyl, etc.) non-metallic, non-corrosive materials. Unless otherwise specified,
all screws shall be flathead, installed flush to surrounding material and be ¼ x 20.
E. Hood Services
1. Services shall be provided in each hood as per the hood schedule. Hood shall not have any pre-
punched holes on the hood post except for services per the schedule. Where multiple services
are scheduled, provide one each side.
2. Service fixtures and fittings mounted inside of hood shall consist of color-coded hose nozzle
outlets remotely controlled from the hood post with labeled index handles. The fixtures (valves
and nozzles) shall be constructed from polypropylene unless otherwise noted. The valve body
shall be easily removed from the front for repair.
3. Service fixtures shall be provided with piping, from the outlet/valve to the exterior. Where
services are scheduled on both sides of the hood, piping shall be connected for a coordinated
single point connection to the building services.
4. Exhaust duct washdowns, where specified, shall consist of three, ¾-inch polypropylene pipes
(spray bars) extending horizontally across the rear exhaust duct, evenly spaced vertically and
sealed on one end. Each spray bar shall consist of replaceable, 1/8-inch NPT, polypropylene
spray heads, with a 110-degree spray angle and 0.28 GPM at 10 PSI, on 12-inch centers,
orientated down toward the floor. The spray bars shall be manifolded to a common point
through a ball valve mounted on the hood post as shown on the drawings for operator control
(on/off and flow rate). The valve shall be plumbed out the rear of the cabinet for connection to
building utilities. A 1½-inch, NPT threaded drain hole shall be installed in the center of the floor
of the exhaust duct to remove washdown water. The floor shall insure complete drainage of
wash water.
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