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ETL Installation - 1 Hour Combustible Floor/Ceiling Assemblies
(formerly Warnock Hersey)
Ceiling Exhaust Fan Installation
1. Fan/damper assemblies installed in combustible floor
ceiling assemblies with gypsum board ceilings require
the use of a plaster flange (Item 3 in Figure 6). A plaster
flange kit, which comes with all of the necessary
mounting hardware, is supplied with the unit.
2. The fan/damper assembly is to be attached to the
trusses using 2 - 1 in. x 1 in. x 16 ga.
(25mm x 25mm x 1.5mm) or 2 - 11/4 in. x 1 in. x 20 ga.
(32mm x 25mm x 1mm) mounting angles. Attach
mounting angles to the damper with a minimum of
2 - #8 screws or
⁄
in. (4mm) diameter steel rivets.
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32
Note: Make sure the fasteners do not interfere with the
damper operation.
3. Install the fan/damper assembly, with attached mounting
angles, between the trusses as shown in Figure 6 and
attach mounting angles to the trusses using 4 - 11/4 in.
long steel screws per mounting angle.
4. Run a minimum of 4 - 1 in. (25mm) long #6 screws
through the gypsum board into the plaster flange as
shown in Figure 6.
Grille Installation
Mount grille to underside of ceiling radiation damper
using #10 x
⁄
in. Phillips head stainless steel sheet
1
2
metal screws provided with SP fan.
®
Figure 6: CRD with SP Fan
CRD Series for SP Fans
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