DIYbanter - View Single Post

Doug Miller

In article , wrote:
On 23 Jan, 14:04, "Steve Barker"
wrote:
[top-posting corrected]
wrote in message

...
I need to extract 247 cubic metres per hour from my bathroom. I will
be using a 150mm ceiling fan capable of extracting 250 m3/ph. Can you

i'm not sure about your duct sizing, but i'm curious as to why you need to
move so much air AND where is the replacement air coming from?

What do you mean, "so much air"?? 247 cubic meters per hour is 145 cubic feet
per minute, which isn't really all that much. Rule of thumb for venting a
bathroom is 1.07 cfm per square foot of floor space, so that corresponds to an
area of about 136 sq ft. What's the big deal?