Munchkin 399M Installing, Operating & Maintaining page 13

RECOMMENDED VENTING CLEARANCES PER THE NATIONAL FUEL GAS CODE*
*IMPORTANT NOTE
Direct vent terminal clearance
HEAT TRANSFER
Minimum clearance, C
PRODUCTS
RECOMMENDS A
Input (Btu/hr)
MINIMUM
10,000 or less
CLEARANCE OF 4
10,001 to 50,000
FEET WHERE THE
Over 50,000
PLUME CAUSED BY
(see 10.8.3)*
THE UNIT MAY
For SI units: 1 ft = 0.305 m; 1 in. = 25.4 mm;
OBSTRUCT VIEWS
1 Btu/hr = 0.293 W
OR AFFECT THE
COSMETIC LOOK OF
THE BUILDING.
EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEM
Flue Gas will condense as it exits the vent termination. This condensate can freeze on
exterior building surfaces which may cause discoloration of these surfaces.
Consideration should be given to the plume of condensation that exits the exhaust
which may affect the cosmetic appearance of the building.
All venting must be properly supported. The Munchkin is not intended to support any venting
whatsoever. All piping, glue, solvents, cleaners, fittings and components, must conform to ASTM
(American Society for Testing and Materials), and ANSI (American National Standards Institute). It is
recommended that you use one of the optional vent kits specifically designed for Munchkin installa-
tions, available from Heat Transfer Products, Inc.
Example: Installation requires the following material for both inlet and exhaust piping for the
Munchkin
Clearance (in.)
6
9
12
* REFERENCE: THE NATIONAL FUEL GAS CODE 2002 EDITION
CAUTION
Friction Loss Equivalent Table for 4" or 6" vent
Fittings or Piping
4" or 6" 90 degree elbow
4" or 6" 45 degree elbow
4" or 6" Coupling
4" or 6" air inlet tee
4" or 6" Plastic Pipe
4" or 6" V2000 vent kit
Equivalent Feet
= 5
= 3
= 0
= 0
= 1
= 0
VENTING
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