Best 639 Installation manual
3¼” x 10” RECTANGULAR DUCT
WALL CAP INSTALLATION
INSTRUCTIONS
Plan installation carefully. Before installing wall cap, make
sure that birdscreen is in place and bowed outward. Make
sure that birdscreen does not interfere with movement of
damper flap. Refer to Figure 5 and Step 8 under “Maintenance.”
Wall cap accepts 3¼” x 10” duct. Tape all ductwork joints with
duct tape to prevent air and water leaks.
INSTALLATION IN NEW BRICK CONSTRUCTION
1. Cut opening 3½” x 10¼” in sheathing or wall board so that
wall cap will line up easily with duct.
2. Determine thickness of final wall and adjust wall cap and duct
to that cap will be flush with face brick. (Fig. 1)
3. After face brick is installed, nail or screw cap to wall using
holes in wall cap flange.
4. Caulk all around flange with high-quality caulking compound. (Fig. 2)
5. Run ductwork from range hood or fan. Tape all joints with
duct tape.
INSTALLATION IN FRAME CONSTRUCTION
1. Cut opening 3½” x 10¼” in wall so that wall cap will line
up easily with ductwork. (Fig. 3)
2. Nail down siding corners. Trim opening in siding with casing strips. (Fig. 4).
3. Determine thickness of final wall and adjust wall cap and
duct so that cap will be flush with siding. (See Fig. 1)
4. Nail or screw cap to wall using holes in wall cap flange.
5. Run ductwork back to range hood or fan. Tape all joints
with duct tape.
6. Seal all around flange with high-quality caulking compound. (See Fig. 2)
MAINTENANCE (See Figure 5)
To replace damper flap or gasket material:
1. Remove birdscreen using sharp point (screwdriver, knife,
etc.), pull down and pop screen out.
2. Using a pointed-nose pliers, squeeze barbs on black
damper bushing and push bushing out (remove bushing
on one side only).
3. Pull damper rod out of flap.
4. Replace defective or worn parts.
5. Replace damper flap with rib on outside, and push damper
rod through cap and part way through notch in center of flap.
6. Slide spring over rod and push rod through flap. Make sure
that rod seats itself into damper bushing.
7. Push damper bushing into cap. Make sure that damper
flap opens freely.
8. Replace birdscreen. Birdscreen must bow outward as
shown in Figure 5 to ensure free movement of damper flap.
NOTE: The high quality paint coating on our outdoor accessories may be used as the exterior finish or as a prime coat
for the finish of your choice. Apply the coating best suited for
the special conditions of your application.
KEY PART NO. DESCRIPTION
1 97006177 Housing (Painted)
97006251 Housing (Aluminum)
2 98005586 Bird Screen
3 98005588 Damper Flap
4 99500323 Long Sealant Strip
5 98005585 Damper Rod
6 99100379 Damper Bushing (2 req.)
7 99140100 Damper Spring
Broan-NuTone LLC Hartford, WI
www.broan.com 1-800-558-1711
99040510D 99040510D 99040510D 99040510D
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