L.B. White 220 Therma Grow - Manual (Page 10)

INDOOR VENTILATION REQUIREMENTS
This heater requires a properly sized, motorized air inlet
shutter and exhaust fan for indoor installation. These
components, along with specific instructions, are provided
in indoor ventilation kit # 25985.
Air Inlet
Locate the air inlet directly beneath the heater and align it
to the heaters air inlet for combustion air supply. Ensure
the motorized air inlet and the heater’s air inlet are kept
free of any blockages.
■
The air inlet must be located directly beneath the
heater’s air inlet, and have access to outside fresh air.
See Fig. 4a.
■
The heater draws its combustion air through holes in its
base. The motorized air inlet must be centered to the
heater’s air inlet. See Fig. 4b.
■
The motorized air inlet must be no more than 1 ½ ft.
from the back of the heater and properly aligned to the
heater. See Fig. 4c.
■
The heater should have a minimum clearance of 1 ½ ft.
above the ground. See Fig. 4c.
Refer to Figs. 4a, 4b, and 4c for air inlet placement. If the
air inlet must be installed away from the heater in a location
other than as follows, duct kit part number 25987 must
also be installed to allow supply of combustion air to the
heater.
FIG. 4a
Blower Outlet View
FIG. 4b
Underside View
FIG. 4c
Side View
1 1/2 FT MAX.
MOTORIZED AIR INLET
ALIGNED TO AIR INLET
IN BASE OF HEATER
HEATER AIR INLET
AIR INLET
TRANSITION
CENTERED
INTERIOR EXTERIOR
1 1/2 FT MAX.
OUTSIDE
AIR SOURCE
1 1/2 FT
MAX.
TOP OF AIR INLET
TRANSITION ALIGNED
WITH BASE OF HEATER
OUTSIDE
AIR SOURCE
AIR
DISCHARGE
1 1/2 FT
MIN.
OUTSIDE
FRESH AIR
OUTSIDE
FRESH AIR
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