12
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater
Operating Instructions and Owner’s Manual
Canadian Installations1
US Installations2
A=
Clearance above grade,
12 inches (30 cm)
12 inches (30 cm)
veranda, porch, deck or
balcony
B=
Clearance to window or door
6 inches (15 cm) for appliances
<
6 inches (15 cm) for appliances
<
that may be opened
10,000 Btuh (3 kW), 12 inches (30
10,000 Btuh (3 kW), 9 inches (23
cm) for appliances > 10,000 Btuh
cm) for appliances > 10,000 Btuh
(3 kW) and
<
100,000 Btuh (30
(3 kW) and
< 50,000 Btuh (15
kW), 36 inches (91 cm) for
kW), 12 inches (30 cm) for
appliances > 100,000 Btuh (30 kW)
appliances > 50,000 Btuh (15 kW)
C=
Clearance to permanently
*
*
closed window
D=
Vertical clearance to ventilated
*
*
soffit located above the
terminal within a horizontal
distance of 2 feet (61 cm) from
the center line of the terminal
E=
Clearance to unventilated soffit
*
*
F=
Clearance to outside corner
*
*
G=
Clearance to inside corner
*
*
H=
Clearance to each side of
3 feet (91 cm) within a height 15
center line extended above
feet (4.5 m) above the
*
meter/regulator assembly
meter/regulator assembly
I=
Clearance to service regulator
3 feet (91 cm)
*
vent outlet
J=
Clearance to nonmechanical air
6 inches (15 cm) for appliances
<
6 inches (15 cm) for appliances
<
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
36 inches (91 cm) for appliances
inches (30 cm) for appliances >
> 100,000 Btuh (30 kW)
50,000 Btuh (15 kW)
K=
Clearance to a mechanical air
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet
supply inlet
(3 m) horizontally
L=
Clearance above paved
7 feet (2.13 m) +
*
sidewalk or paved driveway
located on public property
M=
Clearance under veranda,
12 inches (30 cm) ++
*
porch deck, or balcony
1
In 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.”
Typical Installation
The Illustration below shows a typical installation of the MHT 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.
(*) For minimum mounting height in aircraft hangars and public
garages.
X Dimension
Model
Min.
Max.
MHT-45
102"
114"
Minimum
Recommended
for servicing
24"
15"
Vent terminal
Exterior Wall
Outside wall thickness -
10" max. 1/2" min.
Burner Box
Reflector
Minimum Mounting
Height- 7 feet*
6" Min
X
1" Max.
Suspension
Points
Section 4 VENTING
This appliance is certified under the ANS/CSA Standard for Vented
Gas-Fired Space Heating Appliances. In accordance with these
standards all sidewall venting must conform to the supplied diagram
for Vent Terminal Clearances, which are stated for both U.S. and
Canadian installations. These clearances should be compared
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
Propane Installation Code. Clearances not covered in the table or
above listed codes must comply with local installation codes and the
requirements of your local gas supplier.