Specification Sheet

296
PRESSURE LOSS GUIDE FOR WALL HOUSING ACCESSORIES
NOTE: Supply applications have the fan venturi spun on the opposite side of the fans shown above. The fans shown are exhaust.
Rainhoods are required on supply applications and recommended on exhaust applications where additional weather protection is desired.
Exhaust and/or supply fans installed as shown should be serviced from the interior of the building. Where service is required from the
exterior of the building, consult the factory or representative for recommendations. All bracing shown is eld provided. Field ashing and
caulking of wall housing seams and unused mounting holes, will ensure a weather resistant installation.
Use the estimated pressure drop graphs to help select the proper exhaust or supply fan package that will deliver the desired airow. Enter
the graph from the bottom at the specied CFM and move vertically upward to the fan curve for the desired fan size, then horizontally to
the left and read the estimated static pressure drop resulting from these typical accessory packages. Add the accessory pressure loss to
the system (or building) design static pressure loss to obtain the total static pressure loss to be used for the proper fan selection.
WALL HOUSING STANDARD MOUNTING ARRANGEMENTS
Wall housing ush with outside wall
Exhaust Airow
with Wall Housing
Gravity Damper
Rainhood
Motorside Guard
Supply Airow
with Wall Housing
Gravity Damper
Rainhood
Motorside Guard
Wall housing centered within wall
Wall housing ush with inside wall
The most common mounting arrangement (below left) leaves a clean building exterior and allows access to the fan, motor and drives from
inside the building. Additional bracing angle, rod or cable (eld provided) should be used in addition to the mounting angles to support
the fan and wall housing assembly.
MODELS LCE/LCS, L2E/L2S, L3E/L3S
BELT DRIVE SIDEWALL PROPELLER FANS