DUCTWORK
ATTACHING DOWNFLOW DUCTWORKTO ROOF CURB
Supply and return air flanges are provided on the roof curb for easy
duct installation. All ductwork must be run and attached to the curb
before the unit is set into place.
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three-inch canvas
connectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to mini-
mize air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closer
than two feet from the unit, to minimize noise and resistance.
AIR PROOF
THIS SEAM _T BASE
FIELBDUCT.ql\
JJ 'UNIT DUCT
FLANGE
_I_ / AIR PROOF
UN,TBASE
" FIELD DUCT
AIR PROOF
_ THIS SEAM
FIELDDucTJL _TBASE
a UNIT DUCT FLANGE
UNIT
FLANGE
UNIT BASE
NOT RECOMMENDED
SEAM
WITH BUTYL OR
SILICONE
FIELD DUCT
ATTACHING HORIZONTAL DUCTWORK TO UNIT
All conditioned air ductwork should be insulated to minimize heating
and cooling duct losses. Use a minimum of two (2) inches of
insulation with a vapor barrier. The outside ductwork must be
weatherproofed between the unit and the building.
When attaching ductwork to a horizontal unit, provide a flexible
watertight connection to prevent noise transmission from the unit to
the ducts. The flexible connection must be indoors and made out
of heavy canvas.
NOTE: Do not draw the canvas taut between the solid ducts, i
WEATHERPROOF
UNIT THIS SEAM
FLANGE FIELD DUCT
DOWNFLOW
The following warning complies with State of California law, Proposition 65.
kWARNING: This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
UNIT EXTERIOR
UNIT DUCT FLANGE
WEATHERPROOF
THIS SEAM
FIELD DUCT
UNIT EXTERIOR
/ ]I - WEATHERPROOF
/ _ THIS SEAM
UNIT DUCT
FLANGE FIELD DUCT
HORIZONTAL
• Wash clothes separately from other clothing: rinse
washer thoroughly.
fibers are believed by the State of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation.
PRECAUTIONARY MEASURES
• Avoid breathing fiberglass dust.
• Use a NIOSH approved dust/mist respirator.
• Avoid contact with the skin or eyes. Wear long-
sleeved, loose-fitting clothing, gloves, and eye
protection.
• Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
FIRST AID MEASURES
Eye Contact - Flush eyes with water to remove dust.
If symptoms persist, seek medical
attention.
Skin Contact - Wash affected areas gently with soap
and warm water after handling.
Page 12
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