Attaching Downflow Ductwork to Roof Curb

DUCTWORK

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

UNIT BASE

FIELD DUCT

	UNIT DUCT
	FLANGE
	AIR PROOF
	THIS SEAM
UNIT DUCT	UNIT BASE
FLANGE	UNIT BASE
	FIELD DUCT

AIR PROOF

THIS SEAM

UNIT BASE

FIELD

DUCT

UNIT DUCT FLANGE

UNIT BASE

UNIT DUCT

FLANGEWATERPROOF SEAM

WITH BUTYL OR

SILICONE

NOT RECOMMENDED

FIELD DUCT

DOWNFLOW

The following warning complies with State of California law, Proposition 65.

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.

	UNIT EXTERIOR
	WEATHERPROOF
UNIT DUCT	THIS SEAM
FLANGE	FIELD DUCT

UNIT EXTERIOR

UNIT DUCT FLANGE

WEATHERPROOF

THIS SEAM

FIELD DUCT

	UNIT EXTERIOR
	WEATHERPROOF
UNIT DUCT	THIS SEAM
UNIT DUCT
FLANGE	FIELD DUCT

HORIZONTAL

WARNING: This product contains fiberglass wool insulation! Fiberglass dust and ceramic 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.

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●Wash clothes separately from other clothing: rinse washer thoroughly.

●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.

YCZ036F1/3M0B, YCZ035F1 specifications

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