Clothes Dryer Vent Tables
Clothes Dryer Vent Tables
Properly connecting a dryer to an outside vent terminal is not as simple as it might seem. You need to be concerned with the total length of run of the pipe, the type of pipe you use, how many bends are in the pipe, and the design/shape of vent terminal at the end of the pipe.
The dryer blower only produces so much energy. This energy is offset by friction within the vent pipe. This is why you must be concerned with the total length of the pipe. Ninety degree angles also create friction. Each bend equals the friction the air would encounter if it ran through an additional 10 feet of straight pipe. Smooth metal pipe offers less friction than flexible pipe with lots of little ridges within the pipe. The vent cover shape and design is important as it also acts as a partial dam or blockage to the exiting air. A vent with a wide mouth opening say four inches or so or one with the little louver doors that swing wide open offer the least resistance. The smaller the vent opening the greater the amount of final resistance.
Use the tables below to calculate how far your vent can be from the dryer. Pay attention to the type of pipe you have and the vent configuration!
Vent cap with wide four inch opening or mini-louvers and smooth metal pipe
- Total Pipe length can be 64 feet with No bends
- Total Pipe length can be 54 feet with 1 bend
- Total Pipe length can be 44 feet with 2 bends
- Total Pipe length can be 35 feet with 3 bends
- Total Pipe length can be 27 feet with 4 bends
Vent cap with narrow 2.5 inch opening and smooth metal pipe
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Vent cap with wide four inch opening or mini-louvers and flexible ribbed pipe
- Total Pipe length can be 36 feet with No bends
- Total Pipe length can be 31 feet with 1 bend
- Total Pipe length can be 27 feet with 2 bends
- Total Pipe length can be 25 feet with 3 bends
- Total Pipe length can be 23 feet with 4 bends
Vent cap with narrow 2.5 inch opening and flexible ribbed pipe
- Total Pipe length can be 28 feet with No bends
- Total Pipe length can be 23 feet with 1 bends
- Total Pipe length can be 19 feet with 2 bends
- Total Pipe length can be 17 feet with 3 bends
- Total Pipe length can be 15 feet with 4 bends
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