Typical Installation
The Illustration below shows a typical installation of the MHT / HST tube heater. The installation drawing shown has a straight horizontal venting arrangement and specifies the minimum space required for maintenance, as well as the allowable range of distances between the two suspension points.
Detailed venting arrangements are illustrated in following portions
of this section. | Minimum |
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24" | 15" | 1" Max. | Suspension |
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Vent terminal | Burner Box | Reflector |
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Exterior Wall |
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| 10" max. 1/2" min. | Minimum Mounting |
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| Height- 7 feet* |
X Dimension
Model Min. Max.
HST- 45 102" 114"
(*)For minimum mounting height in aircraft hangars and public garages.
Section 4 VENTING
This appliance is certified under the ANS/CSA Standard for Vented
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A= | Clearance above grade, | 12 inches (30 cm) | 12 inches (30 cm) | ||||||||||||
| veranda, porch, deck or |
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B= | Clearance to window or door | 6 inches (15 cm) for appliances < | 6 inches (15 cm) for appliances < | ||||||||||||
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| that may be opened | 10,000 Btuh (3 kW), 12 inches (30 | 10,000 Btuh (3 kW), 9 inches (23 | ||||||||||||
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| cm) for appliances > 10,000 Btuh | cm) for appliances > 10,000 Btuh | ||||||||||||
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| (3 kW) and < 100,000 Btuh (30 | (3 kW) and < 50,000 Btuh (15 | ||||||||||||
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| kW), 36 inches (91 cm) for | kW), 12 inches (30 cm) for | ||||||||||||
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| appliances > 100,000 Btuh (30 kW) | 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 < | 6 inches (15 cm) for appliances < | ||||||||||||
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| supply inlet to building or the | 10,000 Btuh (3 kW), 12 inches (30 | 10,000 Btuh (3 kW), 9 inches (23 cm) | ||||||||||||
| combustion air inlet to any | cm) for appliances > 10,000 Btuh (3 | for appliances > 10,000 Btuh (3 kW) | ||||||||||||
| other appliance | kW) and < 100,000 Btuh (30 kW), | and < 50,000 Btuh (15 kW), 12 | ||||||||||||
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| 36 inches (91 cm) for appliances | inches (30 cm) for appliances > | ||||||||||||
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K= | Clearance to a mechanical air | 6 feet (1.83 m) | 3 feet (91 cm) above if within 10 feet | ||||||||||||
| supply inlet |
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L= | Clearance above paved | 7 feet (2.13 m) + | * |
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| sidewalk or paved driveway |
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M= | Clearance under veranda, | 12 inches (30 cm) ++ | * |
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| porch deck, or balcony |
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1In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
+ 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.
* For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, one of the following shall be indicated:
a)A minimum clearance value determined by testing in accordance with section 2.19.6, or;
b)A reference to the following footnote:
“Clearance in accordance with local installation codes and the requirements of the gas supplier.”
Enerco Group, Inc., | 12 | Operating Instructions and Owner’s Manual |