Combustion/Ventilation Air Requirements - Modine Manufacturing MT28 Installation And Service Manual

INSTALLATION
Figure 4.1
Combustible Material Clearances
REAR
BELOW
THE GAS MANIFOLD AND CONTROLS MUST BE
LOCATED AT THE LOW END OF THE HEATER
Figure 4.2
Typical Rigid Mounting Configuration
OVERHEAD STRUCTURE AND FIELD CONNECTIONS MUST
BE ADEQUATE TO SUPPORT WEIGHT OF THE HEATER.
NOTE:
Gas main and electrical
lines must not cross over
top of heater.
NOTE:
Gas manifold MUST be located
on the low side of the heater.
Figure 4.3
Typical Chain Mounting Configuration
OVERHEAD STRUCTURE AND FIELD CONNECTIONS MUST
BE ADEQUATE TO SUPPORT WEIGHT OF THE HEATER.
NOTE:
Gas main and electrical
lines must not cross over
top of heater.
5' Chain Mounting Set
NOTE:
Gas manifold MUST be located on the low
side of the heater.
4
TOP
35˚ MAX.
10˚ MIN.
3/8" All thread rigid mount
(Used in aircraft hangers or
where draft conditions may be
expected.)
35˚ Maximum
10˚ Minimum
Horizontal Plane
'S' Hooks: 1/4" Dia. wire
(Crimp all 'S' hooks closed)
35˚ Maximum
10˚ Minimum
Horizontal Plane
Figure 4.4
Stacking Height
Mounting
Height
Stacking
Height
Table 4.1
Typical Mounting Height for Full Building Heating
Typical Mounting Height at Min/Max
Model No.
MT28, 30, 33
MT56, 60, 66
MT84, 90, 99
MT112, 120, 132
MT160
Mounting height values are recommendations only and may need to be
adjusted to meet requirements of actual installation.

Combustion/Ventilation Air Requirements

Maintain positive air displacement of 4 cfm per 1000 Btu/hr for
natural gas and 5 cfm per 1000 Btu/hr for propane. The fresh
air supply must be located in the immediate proximity of the
unit(s). Fresh air intake openings are typically located high
on the building sidewalls at a comparable level to the heaters.
One square inch of net free inlet area per 1000 Btu/hr is
required. Multiple inlets, well distributed, should be used and
should direct air upward to prevent drafts at floor level. Inlets
are typically limited to 1 to 2 square feet in size.
It is recommended that units be interlocked with mechanical
exhaust fans for unvented applications. Mechanical exhaust
fans are typically located at high points of the building. For flat
roof areas, a series of small exhausters should be distributed
over the roof areas and interlocked with various heating zones.
Minimum Clearance to
Combustible Materials
Mounting Angles (feet)
10° 35°
8-14 7-12
14-20 12-16
20-26 16-24
26-32 20-30
26-40 22-38