Owner's Manual

Performance Guidelines

IMPORTANT: Problems caused by improper installations are not covered by the manufacturer’s warranty.

IMPORTANT: Undersized and improperly installed duct pipe and/or other ventilation components will cause excessive static pressure (air

resistance), that may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation.

1. Building Codes

BBQ Hood Ventilators should be installed by qualified technicians familiar with state and local building codes.

2. Duct Pipe and Fittings (Elbows, Transitions, Roof & Wall Caps)

a. Use round or rectangular rigid metal duct only. Where possible, use round duct as it creates the least amount of static pressure.

DO NOT use flex duct.

b. All duct sections and fittings (EXCEPT DAMPERS, per Section 4), should overlap and be connected with at least 3 – 4 equally

spaced screws and wrapped tightly with 2 – 3 layers of Aluminum Foil Metal Duct Tape. This type of duct tape is more durable

than traditional cloth duct tape. DO NOT use butt joints.

c. For best air flow, elbows and pipe size transition fittings should not be directly connected to one another. Where possible, always

include at least 15 inches of straight pipe between fittings.

3. Duct Pipe and Fitting Sizes

4. IMPORTANT: No portion of any length of duct pipe or fitting should be smaller than the discharge port of the ventilator. This is very

important because any type of restriction anywhere in the ventilation system will cause increased static pressure (air resistance), that

may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation. See Duct Sizing Chart and Area Calculations

section for more detail.

Duct Runs – Length

a. Configure the ventilation duct run to be as short and as direct to the outside as possible. Minimize the number of elbows and

transition fittings used. Complex or long runs should be reviewed by a qualified installer.

b. No portion of the ducting should be run so that the exhaust air flows downward. Since exhaust heat rises, forcing the air to flow

downward will cause increased static pressure. As previously mentioned, improperly installed duct pipe will cause excessive

static pressure (air resistance), that may result in rattling, vibration and air buffeting noises, as well as inadequate ventilation.

c. Duct runs for 1250CFM ventilator models should not exceed 35 linear feet with two 90-degree elbows and two 45-degree elbows,

and a roof or wall cap. Longer runs or additional elbows will result in decreased ventilation performance. Each 90-degree elbow

is the equivalent of 6 linear feet of duct pipe; each 45-degree elbow is equivalent to 3 linear feet of duct pipe.

d. Always run ventilator ducts to the outdoors. DO NOT terminate a duct into an attic, basement, garage, crawl space under a

house, a chimney, other ducting or an enclosed room.

5. Dampers

IMPORTANT: DO NOT USE ANY TYPE OF DAMPER IN A BBQ HOOD APPLICATION.

In ventilation systems utilizing a roof cap or wall cap with a built-in damper, remove it. Dampers are unnecessary and will cause

increased static pressure (air resistance), that may result in rattling, vibration and air buffeting noises, as well as inadequate

ventilation.

6. Roof Caps and Wall Caps

The roof cap or wall cap is the termination point of the venting system that allows the exhaust air to exit to the outdoors. All sections

of this fitting must have an equal or greater air path area than the ventilator’s discharge port. If any section of the roof cap or wall

cap is smaller than the ventilator’s discharge port, the entire ventilation system will lose efficiency and the restriction will cause