Bathroom Vent Fan Upgrade

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I am upgrading an undersized bathroom fan that is 50 CFM and has (possibly) a 3" to 4" exhaust pipe. The new fan, which is 150 CFM requires a 6" exhaust pipe. Do I need to rip out the existing vent pipe and replace everything with 6" (including the roof vent) or can I get by putting a vent reducer (from 6" to 4")?

bathroom vent exhaust-vent bathroom-fixtures venting

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asked 1 hour ago

Dan Pollack

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up vote
2
down vote

favorite

I am upgrading an undersized bathroom fan that is 50 CFM and has (possibly) a 3" to 4" exhaust pipe. The new fan, which is 150 CFM requires a 6" exhaust pipe. Do I need to rip out the existing vent pipe and replace everything with 6" (including the roof vent) or can I get by putting a vent reducer (from 6" to 4")?

bathroom vent exhaust-vent bathroom-fixtures venting

share|improve this question

asked 1 hour ago

Dan Pollack

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

up vote
2
down vote

favorite

up vote
2
down vote

favorite

I am upgrading an undersized bathroom fan that is 50 CFM and has (possibly) a 3" to 4" exhaust pipe. The new fan, which is 150 CFM requires a 6" exhaust pipe. Do I need to rip out the existing vent pipe and replace everything with 6" (including the roof vent) or can I get by putting a vent reducer (from 6" to 4")?

bathroom vent exhaust-vent bathroom-fixtures venting

share|improve this question

asked 1 hour ago

Dan Pollack

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

I am upgrading an undersized bathroom fan that is 50 CFM and has (possibly) a 3" to 4" exhaust pipe. The new fan, which is 150 CFM requires a 6" exhaust pipe. Do I need to rip out the existing vent pipe and replace everything with 6" (including the roof vent) or can I get by putting a vent reducer (from 6" to 4")?

bathroom vent exhaust-vent bathroom-fixtures venting

bathroom vent exhaust-vent bathroom-fixtures venting

share|improve this question

asked 1 hour ago

Dan Pollack

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 1 hour ago

Dan Pollack

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

share|improve this question

asked 1 hour ago

Dan Pollack

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 1 hour ago

Dan Pollack

111

asked 1 hour ago

Dan Pollack

111

111

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

New contributor

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Dan Pollack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

add a comment | 

1 Answer
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You can install a reducer, but you'll cut your flow volume by an equal proportion:

28.3in² - 7.1in² = 21.2in² (an area reduction of 75%)

This will negate a significant amount of your fan upgrade, will make it work harder, and may shorten the motor's life due to reduced cooling.

You might ask yourself whether you really need 150 cfm (and the accompanying noise).

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edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
3
down vote

You can install a reducer, but you'll cut your flow volume by an equal proportion:

28.3in² - 7.1in² = 21.2in² (an area reduction of 75%)

This will negate a significant amount of your fan upgrade, will make it work harder, and may shorten the motor's life due to reduced cooling.

You might ask yourself whether you really need 150 cfm (and the accompanying noise).

share|improve this answer

edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

add a comment | 

up vote
3
down vote

You can install a reducer, but you'll cut your flow volume by an equal proportion:

28.3in² - 7.1in² = 21.2in² (an area reduction of 75%)

This will negate a significant amount of your fan upgrade, will make it work harder, and may shorten the motor's life due to reduced cooling.

You might ask yourself whether you really need 150 cfm (and the accompanying noise).

share|improve this answer

edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

add a comment | 

up vote
3
down vote

up vote
3
down vote

You can install a reducer, but you'll cut your flow volume by an equal proportion:

28.3in² - 7.1in² = 21.2in² (an area reduction of 75%)

This will negate a significant amount of your fan upgrade, will make it work harder, and may shorten the motor's life due to reduced cooling.

You might ask yourself whether you really need 150 cfm (and the accompanying noise).

share|improve this answer

edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

You can install a reducer, but you'll cut your flow volume by an equal proportion:

28.3in² - 7.1in² = 21.2in² (an area reduction of 75%)

This will negate a significant amount of your fan upgrade, will make it work harder, and may shorten the motor's life due to reduced cooling.

You might ask yourself whether you really need 150 cfm (and the accompanying noise).

share|improve this answer

edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

share|improve this answer

share|improve this answer

edited 7 mins ago

edited 7 mins ago

edited 7 mins ago

answered 29 mins ago

isherwood

40.8k451102

answered 29 mins ago

isherwood

40.8k451102

answered 29 mins ago

isherwood

40.8k451102

40.8k451102

add a comment | 

add a comment | 

Dan Pollack is a new contributor. Be nice, and check out our Code of Conduct.

 

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Dan Pollack is a new contributor. Be nice, and check out our Code of Conduct.

 

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