Mr. Heater MHT 45 owner manual Venting/Ducting, Roof Pitch Min, Horizontal Through the Sidewall

	MINIMUM HEIGHT FROM ROOF
	TO LOWEST DISCHARGE OPENING
Roof Pitch		H (Min)
Flat	to 6/12	1.0 Feet
Over	6/12 to 8/12	1.5 Feet
Over	8/12 to 10/12	2.5 Feet
Over 10/12 to 12/12		4.0 Feet
Over 12/12 to 16/12		6.0 Feet
Over 16/12 to 20/12		7.5 Feet

2.All other gas vents shall terminate not less than 2 feet (0.6m) above the highest point where they pass through the roof and at least 2 feet (0.6m) higher than any portion of a building located within 10 feet (3.1m) as shown in the following illustration.

10ft. or less

Vent Cap

Type B

2ft. min.

Vent Pipe

Type B

(Double Wall)

Storm Collar

Boot Flashing

2" Clearance

Seal joint & annular space.

Vent Pipe (Single Wall)

c) Horizontal Through the Sidewall

This heater, when horizontally vented, must be installed with the approved venting system.

When venting the heater horizontally through a combustible outside wall, the same requirements listed previously for Venting Through the Roof apply except as follows:

1.When venting the heater to the outside of the building through a sidewall, use 3 inch O.D. single-wall metal pipe. This is to

be constructed of galvanized sheet metal or other approved noncombustible, corrosion-resistant material as indicated by state and/or local codes.

2.For horizontal venting, the vent lengths may be as follows: Minimum Equivalent Length = 5 feet of Pipe

Maximum Equivalent Length = 25 feet of Pipe

Use the following correction factors to obtain the equivalent length:

a)Subtract 15 feet if the run is horizontal

b)Subtract 10 feet for an approved vent cap.

c)Subtract 10 feet for each elbow beyond 15 feet from the heater.

d)Subtract 15 feet for each elbow within 15 feet of the heater.

NOTE: To minimize problems associated with condensation in long runs, vent pipe can be insulated.

3.The horizontal venting system approved with this heater consists of the Side Wall Vent Kit (02840) shown are page 3.

4.Limit the quantity of 90° elbows to two. When vent pipe is in a horizontal run, it must be pitched downward ¼ inch per foot towards the vent terminal. The heater must be installed level.

5.The horizontal venting system shall not terminate:

a)Less than 4 feet (1.2m) below, 4 feet (1.2m) horizontally from, or 1 foot (30cm) above any door, window or gravity air inlet into any building. The bottom of the vent terminal shall be located at least 7 feet (2.1m) above grade or above snow accumulation levels as determined by local codes.

b)Less than 3 feet (0.9m) from a combustion air inlet.

c)Less than 3 feet (0.9m) from any other building opening or any gas service regulator.

d)Directly over areas where condensate or vapor could create a nuisance or hazard or be harmful to the operation of gas utility meters, regulators, relief valves, or other equipment. Building materials should be protected from flue gases and condensate.

6.In regions of the country where prevailing winds are consistently higher than 40 mph, it may be necessary to terminate the vent system above the roof level.

Vent Cap

Type “B” Vent

		Single-Wall
18"		Vent Pipe
	Wall	Wall Thimble

Venting/Ducting

For Commercial and Industrial Installations

Only

General Requirements

Use aluminum or teflon tape suitable for 550°F (3M Company tapes #433 or #363) or RTV silicone sealant.

Heater must be vented in accordance with specification ANSI Z223.1

-latest revision. Partial information relating to this specification is provided in this section with regard to size and configurations for venting arrangements. For complete information consult ANSI Z223.1 - latest revision and applicable local codes. Use the following guidelines to help insure an adequate, safe ventin arrangement.

Mr. Heater Gas-Fired Low-Intensity Infrared Heater 14 Operating Instructions and Owner’s Manual