17
Specifying Chimney Heights
Specifying Chimney Heights
If the horizontal distance from the mid-point of the chimney
to the peak of the roof ridge is less than 10 feet, the top of the
chimney must be at least 2 feet above the roof ridge. This is
called the “2 foot in 10 foot” rule.
If the horizontal distance from the chimney’s center
measured across to the ridge of the roof is more than 10 feet,
the top of the chimney still needs to be at least 2 feet above a
point measured from a distance of 10 feet horizontally along
the roof.
Though there are many configurations in meeting these
requirements, chimney height cannot be less than 3 feet above
the roof at the edge of the chimney.
If the roof is flat, the chimney must extend no less than 3
feet from where it intersects the roof. If the chimney is entering
the roof at an angle, measure the shorter angle where the
chimney intersects the roof which should be at least 3 feet.
Note:
The previous guidelines do not take into consideration
outside conditions which may require a higher chimney due
to foliage, other buildings, power lines and weather conditions
in your area. Follow the chimney manufacturer’s installation
guide for further information.
Figure 25
Chimney Termination Units
Chimney Termination Units
You will be installing at or possibly near the top of the
chimney chase flashing. A top termination unit is the essential
piece of equipment in keeping sparks out of the atmosphere.
Before installing this important piece of equipment, you
will have to make a judgment call as to whether or not the
termination unit – like all the other exterior exposed chimney
components, for that matter – should be painted in order to
protect it/them from rusting and weathering. Particularly if you
are installing the appliance and chimney near water or in a high
humidity area, the manufacturer recommends a top quality,
rust-proof paint especially formulated for metal. Follow the
paint manufacturer’s directions, applying the paint well before
you are scheduled to install the round top termination unit or
any of the flashings or flues that will be exposed to outside
weather conditions.
Venting terminals shall not be recessed into walls or siding.
This appliance, when installed, must be electrically grounded
in accordance with local codes and in the absence of local
codes, with the National Electrical Code, ANSI NFPA 70, or the
Canadian Electrical Code, CSA C22.1.
Important Pre-installation Information
Important Pre-installation Information
Before you begin, review the information and safeguards
below regarding the installation and operation of the gas
Appliance.
This appliance may only be connected to the gas
supply listed on the label.
Never use propane gas in a gas
appliance designed for natural gas or natural gas in a gas
appliance designed for use with propane gas.
The gas appliance must be installed by an MFI Certified or
other qualified professional installer. The installation, including
provisions for combustion and ventilation air, must conform
with local codes, or, in the absence of local codes, with the
latest edition of the National Fuel Gas Code, ANSI Z223.1, and
NFPA54.
Keep the appliance area clear and free from combustible
materials, gasoline, and other flammable vapors and liquids.
The appliance must have a gas supply line that has been
installed by a qualified technician in accordance with all local
codes.
The gas supply line must be 1/2” minimum interior diameter. If
the gas line to the appliance is longer than 5’, a larger diameter
line may be necessary.
Burner P/N
BTU*
(x 1000)
Orifice Drill
Size
(top/front)
Included in
Nat
LP
MLGB24 (N) (P)
60
28/48 47/56
MGFP39
MLGB30 (N) (P)
90
19/41
MGFP44
MLGB39 (N) (P)
84
40/55
MGFP49
*Nominal BTU based on gas inlet pressure. Nominal gas inlet
pressure for natural gas is 5” W.C.
