Tjernlund VSUB Series Universal Blowers for Combustion Air or Draft 8504114 - Manual (Page 7)

6
INTAKE HOOD/LOUVER LOCATIONS WHEN USING THE VSUB BLOWER AS A COMBUSTION AIR INTAKE
The VSUB Intake Hood/Louver location must
conform with the BOCA National Mechanical
Code or local codes.
LOCATION:
Outside air exhaust and intake openings shall
be located a minimum of 10 feet (3048mm)
from lot lines or buildings on the same lot.
When openings front on a street or public way,
the distance shall be measured to the center-
line of the street or public way.
INTAKE OPENINGS:
Outside air intake openings shall be located a
minimum of 10 feet (3048mm) from any hazard
or noxious contaminant such as vents, chim-
neys, plumbing vents, streets, alleys, parking
lots and loading docks. When a source conta-
minant is located within 10 feet (3048mm) of an
intake opening, such opening shall be located a
minimum of 2 feet (610mm) below the contami-
nant source.
IN ADDITION TO THESE CODES THE
MANUFACTURER RECOMMENDS THAT:
The Intake Hood/Louver should be a minimum of
1 foot above grade or anticipated snow line.
INTAKE HOOD/LOUVER SIZING WHEN USING THE VSUB BLOWER AS A COMBUSTION AIR INTAKE
When sizing an intake opening for northern climates always use 650'/min as a maximum capture velocity with respect to outside air
being entrained to an inside environment. For southern applications where snow is infrequent, 800 '/min can be used in respect to rain.
DIAGRAM B UNITED STATES
On wall installations, if possible, terminate the Intake Hood/Louver on a wall that does not face the
direction of prevailing winds. This will diminish the possibility of wind infiltration.