Laars MFTHW199 - Indoor Combustion Air

LAARS Heating Systems
Page 26
4.7.3 Indoor Combustion Air
Read and Follow Sections 4.3 Guidelines First.
1. Insert the termination end cap into the intake air duct.
2. Provide two openings to allow for circulation of
combustion air as specied by ANSI Z224.1/NFPA 54.
In Canada refer to CAN/CSA B-149.1
NOTE: The Mascot FT needs fresh air for safe operation and
must be installed so there are provisions for adequate
combustion and ventilation air.
Model MFTHW80 MFTHW100 MFTHW120 MFTHW140 MFTHW199
Maximum Input (BTU/H) 80,000 100,000 120,000 140,000 199,000
Indoor make up air is provided,
a minimum free area of 1 in2
per 1,000 BTU/H
80 in
2
13 1/4˝
(W) x 13 1/4˝ (H)
100 in
2
13 1/4˝
(W) x 13 1/4˝ (H)
120 in
2
13 1/4˝
(W) x 13 1/4˝ (H)
140 in
2
13 1/4˝
(W) x 13 1/4˝ (H)
199 in
2
13 1/4˝
(W) x 13 1/4˝ (H)
Table 7. Adequate Free Area
WARNING
• Use of cellular core CPVC, or Radel (polyphenolsulfone)
in venting systems is prohibited.
• Covering non-metallic vent pipe and ttings with thermal
insulation is prohibited.
• Do not obstruct the ow of combustion and ventilated air.