Maximum length of vent system

C.The blower motor must be connected to the vent system wiring as described in the vent system instructions for connecting the exterior blower motor wiring. Flexible armored or nonmetallic cable must be used. A 1/2" (12.7 cm) U.L./CSA-listed strain relief must be provided at each end of the power supply cable.

Wire sizes must conform to the requirements of the National Electrical Code ANSI/NFPA 70 — latest edition* or Canadian Electrical Code, C22.1 and C22.2 No. 113-M1984 (or latest edition),** and all local codes and ordinances. 14 gauge wire (minimum) is recommended.

WARNING — TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:

Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable Codes and Standards, including Fire Rated Construction. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuel burning equipment to prevent back drafting. Follow the heating equipment manufacturer’s guideline and safety standards such as those published by the National Fire Protection Association (NFPA), and the American Society of Heating Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities.

When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.

Ducted fans must always be vented to the outdoors.

WARNING — To reduce the risk of fire, use only metal ductwork.

This unit must be grounded.

Install this side of the fan facing an unoccupied space.

Venting requirements

Determine which venting method is best for your application. Vent system can extend either through the wall or the roof.

Locate the exterior blower so that the length of the vent system and the number of elbows is kept to a minimum to provide efficient performance. Where possible, exterior blower should be centered between wall studs or roof rafters. The size of the vent system should be uniform. Do not install two elbows together. Use duct tape to seal all joints in the vent system. Use caulking to seal exterior wall or floor opening around the cap.

Flexible vent is not recommended. It creates back pressure/air turbulence and greatly reduces performance.

Make sure there is proper clearance within the wall or ceiling for exhaust vent before making cutouts. Avoid pipes, wires, or other vent systems that may be running through the wall. Do not cut a joist or stud unless absolutely necessary. If a joist or stud must be cut, then a supporting frame must be constructed.

The exterior blower carton contains a black plastic vent collar.

•The black plastic vent collar attaches to the exterior blower using four screws provided. The 10" (25.4 cm) round vent system attaches to this collar.

Make sure that there is enough space for any vent transitions that may be needed between the exterior blower and the connecting vent system.

For optimum performance, locate any necessary vent transitions nearest to the vent system that will be used with this power system.

This exterior blower requires a separate U.L./CSA approved wiring cable that should be installed at the same time the vent system is being installed.

Vent	Length

10" (25.4 cm) round	55 ft. (16.8 m)

Vent length is given as a general reference only. For a longer vent run, or smaller vent system, contact a qualified and trained vent installer. Check with local codes for makeup air requirements, if any.

It is recommended that you use round vent instead of rectangular vent, especially if elbows are required. If rectangular vent is required, if should be transitioned to 10" (25.4 cm) round vent as soon as possible.

For best performance, use no more than three 90° elbows. If more than one elbow is used, make sure that there is a minimum of 24 inches (61 cm) of straight vent between any two elbows. Do not install two elbows together.

Determine the length of vent system you need

To calculate the length of system you need, add the equivalent feet (meters) from chart below for each vent piece that will be needed.

Recommended standard 10" (25.4 cm) fittings

1 ft. round =	90° elbow =	45° elbow =
1 ft. (0.3 m)	5 ft. (1.5 m)	2.5 ft. (0.8 m)

Copies of standards listed may be obtained from:

*National Fire Protection Association One Batterymarch Park

Quincy, Massachusetts 02269

**CSA International

8501 East Pleasant Valley Road Cleveland, Ohio 44131-5575

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KPEU722M specifications

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Venting requirements