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November 16th, 2009 admin

Bathroom Vent Fans – Measuring Fan Volume

How you can Size a bath room Vent Fan

Since the inclination towards bigger spa-like washrooms continues to gain in acceptance, the need for correct venting gets to be much more critical. Though a number of men and women are generally tired of their loud as well as ineffective bathroom fan – certainly not many folks understand how you can correctly size a fan for their preferences.

You will find a couple of distinct strategies to calculate the amount of Cubic Ft A Minute (CFM) of air flow needed to effectively ventilate any rest room. Ensure that you check out the end of the write-up and learn about static pressure. A prolonged duct run from the fan to the outside may alter your calculations.

Technique one

This technique operates upon the supposition that the purpose for bath room venting is eight full air changes each hour. Take your square footage times ceiling height to get the total cubic ft to be vented.

As an example: Bath room measures ten ft across along with 12 ft long. It has eight foot ceilings. Thus 10 x 12 x eight equals 960 cubic feet.

We then take this number of cubic feet and divide by 60 – which will be the number of minutes in an hour. We next take the outcome and multiply by 8 (remember, the target will be eight full air changes every hour). The full formula will be as follows:

The First Step

10 feet By twelve feet By eight ft equals 960 cubic ft.

Step 2

960 is then divided by 60 equals 16.

STEP 3

sixteen x 8 equals 128

And so – we will need 128 CFM of air movement in order to effectively vent this particular bath room. Supposing there’s not really an overly extended or twisting duct run to the outside – we’d pick a fan which moves some where around 130 CFM or greater. Good examples will be the Panasonic FV series as well as Broan QTXE series, both of which you’ll find with a rating of a hundred and fifty CFM. In the event that an inline fan is actually preferred – the Fan-tech FR 110 could be sufficient.

Technique two

This strategy is a easy one – for restrooms below one hundred square feet. Based on guidelines of HVI (Home Venting Institute) bathrooms a hundred sq . ft . or less call for 1 CFM for every square foot of restroom – with a minimum of fifty CFM.

Consequently – when you have a 7 foot by 9 ft . bath – you need 63 CFM. It does not get any easier | more straight forward than this. The majority of traditional ceiling insert fans, nevertheless, are generally rated either fifty or eighty CFM – therefore you’ll have to round up or down (we recommend you round up).

Strategy 3

This approach of calculation is designed for bath rooms over 100 sq . ft . and factors in the number of fixtures within the bathroom (lavatories, showers, bathtubs). The actual guidelines are:

- Allow fifty CFM for every typical toilet, shower or bathtub

- Whirlpool and jetted bathtubs will need 100 CFM

Consequently – when you have a single lavatory (50 CFM), a single shower (fifty CFM) and a single whirlpool bathtub (one hundred CFM) – you will need a 200 CFM Fan. A Pansonic FV series would likely function nicely in this bath room. An inline fan system that will perform nicely in this powder room will be the Fan tech PB series. That package consists of a 200 CFM fan and allows for 2 exhaust grilles within the ceiling.

A bathroom vent fan ought to overcome resistance while pushing air from the inlet, thru the duct, to the exterior of the building. This specific resistance is generally known as static pressure. The particular quantity of static pressure is determined by the duct lengths, kind of duct, elbows along with the roof jack as well as wall cap. Basically, the more elbows and duct length, etc. you have got – the more static pressure will likely be found and less efficient CFM you will get out of your fan.

About the Author

I’m a contractor and household improvement professional. Bathroom Vent Fans

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