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4
®
Model MSX Make-Up Air
5. Assemble and Attach Weatherhood
The weatherhood can now be assembled and
attached to the unit. Detailed assembly instructions
can be found with the weatherhood. If the optional
evaporative cooling module was selected, this step
does not apply, refer to the Installation of the Optional
Evaporative Cooling Module section, page 7.
6. Seal Weatherhood Seam
Using an appropriate sealant, seal the seam between
the weatherhood and the unit.
NOTE
The use of all lifting lugs and a set of spreader bars
is mandatory when lifting the unit.
NOTE
Some units come with the weatherhood attached
and Step 5 may not apply.
Installation of
Arrangement DB / HZ / UB
1. Install Curb and/or Equipment
Support(s)
Position curb/equipment support(s) on the roof
(reference the CAPS submittal for placement of curb/
equipment support(s) in relation to the unit). Verify
that unit supports are level, shim if necessary. Attach
curb to roof and flash into place. Attach the equipment
support(s) to the roof, remove metal cover, flash to
wooden nailer and reinstall cover.
2. Install Ductwork
Good duct practices should be followed for all ductwork.
All ductwork should be installed in accordance with
SMACNA and AMCA guidelines, NFPA 96 and all local
codes. Reference the CAPS submittal for ductwork sizes.
3. Apply Sealant
Apply an appropriate sealant around the perimeter of
the curb
and duct
adapter(s)
to isolate
fan
vibration
and prevent
water
penetration.
4. Install Unit
Use a crane and a
set of spreader bars
hooked to the factory
lifting lugs to lift and
center the unit on
the curb/equipment
support(s).
Use self-tapping
sheet metal screws
to fasten the unit to
the curb/equipment
support(s).
Supply Air Ductwork
(Arrangement DB only)
Sealant
NOTE
The use of a duct adapter is recommended on a
downblast (DB) arrangement to align the ductwork
with the supply unit. The duct adapter is only a
guide and is not to be used as a support for the
ductwork.
Setting Unit
Ductwork
Metal Cover
Equipment
Support
Roof Curb
Roof Curb and Equipment Support
Complete Rooftop Installation