Our master bath opens to our bedroom no door separating the rooms should I take this into account when choosing a fan? A scientifically presented article that prompts me to ask a somewhat unrelated question. Though the article is for bathroom ventilation my question is somewhat tangential. I have a small hall of 33 ft x 33 ft x 12 ft plus a pyramidal roof above that. During the summer the inside observed temperature is 34 celsius.
Outside temperature is 27 C. Is it possible to use exhaust fans to bring down the temperature to say 29 C? Assume only 1 door to the hall 9 ft by 8 ft. Will it be of help if we deploy a set of fans at the lower height to pump in the outside air and another set at higher height to take the hot air out?
AC is not an option for us. How to figure out the CFM required? How to ensure good air current through out the hall? Is there another way to bring the temperature down? Than just using a vacumn and a tooth brush for hours? What about installation on a slanted ceiling? Will it damage the impeller bearings and will this installation provide and acceptable level of venting to avoid moisture removal?
We want fan light in shower. How many cfm should I get? There are lights made for wet locations that can be safely installed in the shower, but the fan should be outside the shower enclosure. Compute its cfm based on the area of the entire room.
Will I have installation problems new fan too large or too small with the new fans of today!! Thank You for the information!!! Is it real quiet or real loud? I have a 12 x 12 room with a hot tub. Should I also run a de-humidifier? When we take a hot shower, the ceiling and walls are wet. What can I do to fix this problem before my walls start peeling?
It is a new fan. Our bathroom 1. Will an 80 cfm fan pull in enough fresh air to alleviate the problem? I need a 62 cfm bathroom exhaust fan per calculated. I have 6 foot flex, standard diameter, going to a roof vent. What added fan cfm should I have for duct work? The roof vent does not have a back draft damper for back draft to bathroom. Bathroom exhaust fan are rated in CFMs which stands for cubic feet per minute.
Basically, CFM is a rating that will tell you how much the bath fan can exhaust in one minute. Most bathroom fan sizes range in the cfm to cfm range. I have never seen a bathroom fan that is smaller than cfm, and I have rarely seen one in a residential home that is greater than around cubic feet per minute.
The downsides of installing an under-powered bathroom fan is that it won't effectively remove the moisture and smells from the room. One of the big problems with installing an over-powered bathroom fan is that it may cause negative air pressure problems in the home such as hazardous backdrafting of gas appliances.
For backdrafting to occur, you would probably need a very powerful bathroom fan or multiple. It is also more likely to occur with an over-powered range hood or attic fan not a bath fan but it is something to keep in mind.
An important guideline for bathroom exhaust fan sizing is from the Home Ventilating Institute , an industry non-profit. HVI recommends that homeowners have a minimum of 1-CFM for every square foot for bathrooms in the sf to sf floor size range. And quite frankly, for small bathrooms, you will have a hard time finding a bathroom fan that is less than CFM anyways.
For larger bathrooms of sf or more, HVI recommends that you add up the CFM based on the number of plumbing fixtures—rather than calculating based on floor size. If your bathroom is large enough, it may be important to invest in a second bathroom exhaust fan.
This ensures that the enclosed space is properly taken care of. Otherwise, air in that part of the bathroom will go untouched leading to unwanted odors and mold. However, most secondary spaces such as enclosed toilet areas require nothing more than a simple 50 CFM bathroom exhaust fan. This allows the primary bathroom exhaust fan an opportunity to do its job. When sizing a vent fan, a factor to consider is duct size and length.
Most 50 CFM fans will run well with 4-inch round duct. But as you get up into the higher CFM fans, duct size will have to be increased to 5- or 6-inch round duct. The length of run, as well as the number fittings, elbows, etc. There are somewhat complicated formulas for calculating proper duct size for different length runs and configurations, but the instructions that come with the fan will outline the requirements.
Just make sure there is sufficient space for the ductwork in the area where you're installing the fan. Trying to force too much air through undersized duct will make the fan work too hard and will provide insufficient venting.
For bathrooms over square feet, exhaust fans can be sized according to the number of fixtures in the room. To calculate using this formula, add up the required CFM ratings for all of the fixtures:. For example, if your bathroom includes just a shower and a toilet, it needs a CFM fan, while a bathroom with a jetted tub, toilet, and shower needs a CFM fan.
Another calculation method is useful for large rooms with high ceilings well over 8 feet. In this method, multiply the square footage by the ceiling height, divide by 60 minutes in one hour , then multiply by 8 recommended number of air exchanges per hour. For example, for a room that's square feet and has a foot ceiling:. If your bathroom has a toilet or shower area enclosed by a door, it's a good idea to install a separate exhaust fan for that area.
If the enclosed space is small, a 50 CFM fan should suffice. Otherwise, use the appropriate calculation based on the room size. Just remember that the fan needs airflow to do its job. If the door to the enclosure is closed and there's no gap at the bottom of the door, the fan will be starved of "makeup" air and will perform poorly.
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