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MODELS 250, 251
Input: 250,000, 251,000 Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
250/251,000 1 Ft. - - - - - - 8 8
250/251,000 - - - 8 8 8 8 8
250/251,000 3 Ft. - 8 8 8 - 8 7 7
Number Combined Input
of Heaters in Thousands of Btuh Manifold and Common Vent Diameter (In inches)
2 480 14 12 12 10 10 10 8 8
500/502 14 12 12 10 10 10 10 8
3 720 14 14 14 12 12 12 10 10
750/753 16 14 14 14 12 12 10 10
4 960/1000/1004 18 16 16 14 14 14 12 12
MODEL 275
Input: 275,000 Btuh Total Vent Height (Feet)
Draft Hood: 6” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
275,000 2 Ft. - - - - - 8 8 8
275,000 3 Ft. - - - 8 8 8 8 8
Numbers Combined Input
of Heaters in Thousands of Btuh Manifold and Common Vent Diameter (in inches)
2 550 - - - 1210101010
3 825 - - - 1414121212
4 1100 - - - 1614141212
MODEL 305
Input: 305,000 Btuh Total Vent Height (Feet)
Draft Hood: 8” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
315,000 1 Ft. - - 10 10 10 10 10 10
305,000 2 Ft. 10 10 10 10 10 10 8 8
365,000 3 Ft. 10 10 10 10 10 8 8 8
Number of Combined Input
Heaters in Thousands of Btuh Manifold & Common Vent Diameter
2 610 14 14 12 12 12 10 10 10
3 915 16 16 16 14 14 12 12 12
4 1220 18 18 16 16 16 14 14 12
MODEL 365, 400
Input: 365,000, 399,000 Total Vent Height (Feet)
Draft Hood: 8” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
365,000 1 Ft. - - - - - 10 10 10
400,000 - - - - - - 10 10
365,000 2 FT. 12 12 10 10 10 10 10 10
400,000 12 12 12 12 10 10 10 10
365,000 3 FT. 10 10 10 10 10 10 10 10
400,000 12 10 10 10 10 10 10 10
Number of Combined Input
Heaters in Thousands of Btuh Manifold & Common Vent Diameter (inches)
2 730 14 14 14 12 12 12 10 10
800 16 14 14 14 12 12 10 10
3 1095 18 18 16 16 14 14 12 12
1200 18 18 18 16 16 14 14 12
4 1460 20 20 18 18 16 16 14 12
1600 22 20 20 18 18 16 14 14
MODEL 500
Input: 500,000 Btuh Total Vent Height (Feet)
Draft Hood: 8” 6 8 10 15 20 30 50 100
Input Btuh Rise Vent Connector Diameter (in inches)
500,000 2 Ft. - 12 12 12 12 12 12 12
500,000 4 Ft. 12 12 12 12 12 12 10 10
500,000 6 Ft. N/A 12 12 12 12 12 10 10
Number of Combined Input
Heaters in Thousands of Btuh Manifold & Common Vent Diameter (inches)
2 1000 18 16 16 14 14 14 12 12
3 1500 22 20 20 18 16 16 14 12
4 2000 24 22 22 20 20 18 16 14
TECHNICAL DATA VENTING, TABLE 3 (Continued)