Ruud AP13370-2 Minimum and Maximum Vent Length, Joining Pipes and Fittings, Cementing Joints

Minimum and Maximum Vent Length

Sea Level (0-2000 ft): 3" Vent*

Number of 90° Elbows	Number of	Minimum Pipe	Maximum Pipe
with Vent Terminal	45° Elbows	Length req. (ft)	Length (ft)
One (1)	None	-	40 (12.19m)
One (1)	One (1)	5 (1.5m)	37.5 (11.43m)
Two (2)	None	-	35 (10.67m)
Two (2)	One (1)	-	32.5 (9.91m)
Three (3)	None	-	30 (9.14m)

Sea Level to High Altitude (0-7700 ft): 4" Vent*

Number of 90° Elbows	Number of	Minimum Pipe	Maximum Pipe
with Vent Terminal	45° Elbows	Length req. (ft)	Length (ft)
One (1)	None	-	55 (17.76m)
One (1)	One (1)	5 (1.5m)	52.5 (16m)
Two (2)	None	-	50 (15.24m)
Two (2)	One (1)	-	47.5 (14.48m)
Three (3)	None	-	45 (13.72m)
Three (3)	One (1)	-	42.5 (12.95m)

High Altitude (2000-7700 ft): 3" Vent*

Number of 90° Elbows	Number of	Minimum Pipe	Maximum Pipe
with Vent Terminal	45° Elbows	Length req. (ft)	Length (ft)
One (1)	None	-	35 (10.67m)
One (1)	One (1)	5 (1.5m)	32.5 (9.91m)
Two (2)	None	-	30 (9.14m)
Two (2)	One (1)	-	27.5 (8.38m)
Three (3)	None	-	25 (7.62m)
Three (3)	One (1)	-	22.5 (6.86m)

*For the 3” and 4” vent, one 90° elbow is approximately equal to 5 feet (1,5m) of pipe. One 45° elbow is approximately equal to 2.5 feet (76,2cm) of pipe.

CAUTION: Before proceeding, make sure you understand the procedure and cautions covered in the sections “Joining Pipes and Fittings” and “Cementing Joints”.

Joining Pipes and Fittings

All pipe, fittings, solvent cement, primers and procedures must conform to American National Standard Institute and American Society for Testing and Materials (ANSI/ASTM) or CSA standards.

WARNING: DANGER OF FIRE OR BODILY INJURY - Solvent cement and primers are highly flammable. Provide adequate ventilation and do not assemble near heat source or open flame. Do not smoke. Avoid skin or eye contact. Observe all cautions and warning on material containers.

Cementing Joints

All joints in the vent piping must be properly sealed and we recommend using the following material:

PVC materials should use ASTM D-2564 grade cement.

CPVC materials should use ASTM F-493 grade cement.

ABS materials should use ASTM D-2235 grade cement.

Cleaner-Primer and Medium Body Solvent Cement

Cut pipe end square, remove jagged edges and burrs. Chamfer end of pipe, then clean fitting socket and pipe joint area of all dirt, grease or moisture.

After checking pipe and socket for proper fit, wipe socket and pipe with cleaner-primer. Apply a liberal coat of primer to inside surface of socket and outside of pipe. Do not allow primer to dry before applying cement.

Apply a thin coat of cement evenly in the socket. Quickly apply a heavy coat of cement to the pipe end and insert pipe into fitting with a slight twisting motion until it bottoms out.

NOTICE: Cement must be fluid; if not, recoat.

Hold the pipe fitting for 30 seconds to prevent the tapered socket from pushing the pipe out of the fitting.

Wipe all excess cement from the joint with a rag. Allow 15 minutes before handling. Cure time will vary according to fit, temperature and humidity.

NOTICE: Stir the solvent cement frequently while using. Use a natural bristle brush or the dauber supplied with the can. The proper brush size is one inch.

CAUTION: FOR PROPER

INSTALLATION:

●DO NOT use solvent cement that has become curdled, lumpy or thickened.

●DO NOT thin solvent cement. Observe shelf precautions printed on the containers.

●For applications below 32° F (0°C) use only low temperature type solvent cement.

●Appropriate solvent and cleaner must be used for the type of vent pipe used (PVC, CPVC or ABS).

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