Question on powervent water heater

Specific Inspection Topics Plumbing Inspections
1

I dont have a picture handy, but I seem to remember that a vent pipe (sch 40) must run vertical off of the blower for a distance before making any turns. Anyone know how far that is, or if I am all wet?

2

Yeah you are correct and no do not recall without lookup.

3

24" sticks in my head. But I cant remember exactly. At least I know to differ to a plumber.

4

Ok heres the picture.

GEDC0127.jpg
GEDC0127.jpg600×800 61.6 KB

5

This is from an AO Smith I installed for my brother. Factors are BTU’s and size of pipe, 2, 3, or 4 inch.

[FONT=Arial-BoldMT]MAXIMUM AND MINIMUM VENT LENGTHS[/FONT]
[FONT=Arial-BoldMT]40,000 BTU Units:[/FONT]
[FONT=Arial-BoldMT]For 2" Venting, the maximum equivalent feet of pipe allowed is 40[/FONT]

**[FONT=Arial-BoldMT]feet (12.2 m). **
[/FONT][FONT=ArialMT]This does not include the supplied vent termination for[/FONT]

[FONT=ArialMT]the water heater. For the 2" venting, one 90° elbow is approximately
equal to 5 feet (1.5 m). One 45° elbow is approximately equal to 2.5
feet (0.8 m). It is recommended that at least 2 feet (0.6 m) of spacing
be used in between all 45° elbows and all 90°elbows.
[/FONT][FONT=Arial-BoldMT]For 3" Venting, the maximum equivalent feet of pipe allowed is[/FONT]
**[FONT=Arial-BoldMT]120 feet (36.6 m). **[/FONT]

[FONT=ArialMT]This does not include the Vent Termination (supplied[/FONT]

[FONT=ArialMT]locally) for the water heater. For the 3" venting, one 90° elbow is
approximately equal to 5 feet (1.5 m). One 45° elbow is approximately
equal to 2.5 feet (0.8 m). It is recommended that at least 2 feet (0.6 m)
of spacing be used in between all 45° elbows and all 90°elbows.
[/FONT][FONT=Arial-BoldMT]For 4" Venting, the maximum equivalent feet of pipe allowed is[/FONT]
**[FONT=Arial-BoldMT]160 feet (48.8 m). **[/FONT]

[FONT=ArialMT]This does not include the Vent Termination (supplied[/FONT]

[FONT=ArialMT][size=2]locally) for the water heater. For the 4" venting, one 90° elbow is
approximately equal to 8 feet (2.4 m). One 45° elbow is approximately
equal to 4 feet (1.2 m). It is recommended that at least 2 feet (0.6 m)[/FONT]

[FONT=ArialMT]of spacing be used in between all 45° elbows and all 90°elbows.

http://www.hotwater.com/lit/im/res_gas/315465-000.pdf[/FONT][/size]