Typical Installation |
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| Section 4 VENTING | ||
The Illustration below shows a typical installation of the MHT tube | This appliance is certified under the ANS/CSA Standard for Vented | ||||
heater. The installation drawing shown has a straight horizontal | |||||
venting arrangement and specifies the minimum space required for | standards all sidewall venting must conform to the supplied diagram | ||||
maintenance, as well as the allowable range of distances between | for Vent Terminal Clearances, which are stated for both U.S. and | ||||
the two suspension points. |
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| Canadian installations. These clearances should be compared | |
Detailed venting arrangements are illustrated in following portions of | to but not less than those specified in the current ANSI Z223.1/ | ||||
NFPA 54, National Fuel Gas Code, or CSA B149.1, Natural Gas and | |||||
this section. | Minimum |
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| Propane Installation Code. Clearances not covered in the table or | |||
| Recommended |
| 6" Min | ||
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| above listed codes must comply with local installation codes and the | |||
| for servicing |
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| requirements of your local gas supplier. | ||
24" | 15" | 1" Max. | Suspension | ||
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Vent terminal | Burner Box | Reflector |
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Exterior Wall |
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Outside wall thickness - |
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10" max. 1/2" min. |
| Minimum Mounting |
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| Height- 7 feet* |
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XDimension
Model Min. Max.
(*)For minimum mounting height in aircraft hangars and public garages.
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| Canadian Installations1 |
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| US Installations2 |
| A= | Clearance above grade, |
| 12 inches (30 cm) |
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| 12 inches (30 cm) |
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| veranda, porch, deck or |
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| balcony |
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| B= | Clearance to window or door |
| 6 inches (15 cm) for appliances < |
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| 6 inches (15 cm) for appliances < |
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| that may be opened |
| 10,000 Btuh (3 kW), 12 inches (30 |
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| 10,000 Btuh (3 kW), 9 inches (23 |
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| cm) for appliances > 10,000 Btuh |
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| cm) for appliances > 10,000 Btuh |
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| (3 kW) and < 100,000 Btuh (30 |
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| (3 kW) and < 50,000 Btuh (15 |
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| kW), 36 inches (91 cm) for |
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| kW), 12 inches (30 cm) for |
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| appliances > 100,000 Btuh (30 kW) |
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| appliances > 50,000 Btuh (15 kW) |
| C= | Clearance to permanently |
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| closed window |
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| D= | Vertical clearance to ventilated |
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| soffit located above the |
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| terminal within a horizontal |
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| distance of 2 feet (61 cm) from |
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| the center line of the terminal |
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| E= | Clearance to unventilated soffit |
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| F= | Clearance to outside corner |
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| G= | Clearance to inside corner |
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| H= | Clearance to each side of |
| 3 feet (91 cm) within a height 15 |
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| center line extended above |
| feet (4.5 m) above the |
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| meter/regulator assembly |
| meter/regulator assembly |
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| I= | Clearance to service regulator |
| 3 feet (91 cm) |
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| vent outlet |
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| J= | Clearance to nonmechanical air |
| 6 inches (15 cm) for appliances < |
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| 6 inches (15 cm) for appliances < |
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| supply inlet to building or the |
| 10,000 Btuh (3 kW), 12 inches (30 |
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| 10,000 Btuh (3 kW), 9 inches (23 cm) |
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| combustion air inlet to any |
| cm) for appliances > 10,000 Btuh (3 |
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| for appliances > 10,000 Btuh (3 kW) |
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| other appliance |
| kW) and < 100,000 Btuh (30 kW), |
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| and < 50,000 Btuh (15 kW), 12 |
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| 36 inches (91 cm) for appliances |
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| inches (30 cm) for appliances > |
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| > 100,000 Btuh (30 kW) |
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| 50,000 Btuh (15 kW) |
| K= | Clearance to a mechanical air |
| 6 feet (1.83 m) |
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| 3 feet (91 cm) above if within 10 feet |
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| supply inlet |
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| (3 m) horizontally |
| L= | Clearance above paved |
| 7 feet (2.13 m) + |
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| sidewalk or paved driveway |
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| located on public property |
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| M= | Clearance under veranda, |
| 12 inches (30 cm) ++ |
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| porch deck, or balcony |
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| 1 | In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code. |
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| 2 | In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code. |
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| + | A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. | |||||
| ++ | Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor. |
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| * | For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, one of the following shall be indicated: |
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| a) A minimum clearance value determined by testing in accordance with section 2.19.6, or; |
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b) A reference to the following footnote:
“Clearance in accordance with local installation codes and the requirements of the gas supplier.”
Mr. Heater
