DIYbanter - Extractor Fan Replacement

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Extractor Fan Replacement - 100mm to 150mm

Hello all, and i do apologise in advance if this has been asked before, but have no reliable people to turn to here for this.

Currently have an Airflow Loovent Eco 100mm extractor fan in the kitchen, that stopped working a few days ago. Looking around, and in consideration of the square hole the existing fan will leave when replaced, I am thinking of replacing it with the Airflow QuietAir QT150B.

1) is it safe / ok to replace with a bigger fan, or do i have to stick with a 100mm fan as a replacement?

2) Read in the forums about centrifugal etc. I know the Loovent is centrifugal, but the QuietAir is "axial high efficiency impeller" (from the description). Do i stick with another cntrifugal model, or can i switch to this axial one?

It is a residential kitchen measuring 3m x 2.2m x 2.2m. Also, considering the fan models mentioned above, if you have suggestions and why I'm more than happy to hear them.

Thanks!

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For full context, visit https://www.homeownershub.com/uk-diy...m-3100269-.htm

Extractor Fan Replacement - 100mm to 150mm

On 23/02/2021 16:15, Polskasweetie wrote:
Hello all, and i do apologise in advance if this has been asked before,
but have no reliable people to turn to here for this.

Currently have an Airflow Loovent Eco 100mm extractor fan in the
kitchen, that stopped working a few days ago. Looking around, and in
consideration of the square hole the existing fan will leave when
replaced, I am thinking of replacing it with the Airflow QuietAir QT150B.
1) is it safe / ok to replace with a bigger fan, or do i have to stick
with a 100mm fan as a replacement?

2) Read in the forums about centrifugal etc. I know the Loovent is
centrifugal, but the QuietAir is "axial high efficiency impeller" (from
the description). Do i stick with another cntrifugal model, or can i
switch to this axial one?

It is a residential kitchen measuring 3m x 2.2m x 2.2m. Also,
considering the fan models mentioned above, if you have suggestions and
why I'm more than happy to hear them.

Thanks!

I'd go for whatever fits the vent hole. In fact you may simply have lost
a starter cap.

some axial fans are quite noisy. check noise levels

--
Gun Control: The law that ensures that only criminals have guns.

Extractor Fan Replacement - 100mm to 150mm

Polskasweetie wrote:
Hello all, and i do apologise in advance if this has been asked before,
but have no reliable people to turn to here for this.

Currently have an Airflow Loovent Eco 100mm extractor fan in the kitchen,
that stopped working a few days ago. Looking around, and in consideration
of the square hole the existing fan will leave when replaced, I am
thinking of replacing it with the Airflow QuietAir QT150B.

There isn't a square hole - there's a 100mm circular hole. The unit is
screwed to the wall/ceiling outside of that area - that may leave a
square-ish part where the paint finish differs if the area has been painted
since the unit was fitted.

1) is it safe / ok to replace with a bigger fan, or do i have to stick
with a 100mm fan as a replacement?

A 150mm unit will need a 150mm hole. Whether you can cut that depends on
what the hole is in. Don't forget there may be a duct behind it, so it's
not just cutting the ceiling but you'd also need to upgrade the duct and
exhaust vent as well. Unless there's a good reason to get a bigger fan
(airflow, noise?) it wouldn't be worthwhile, IMHO.

2) Read in the forums about centrifugal etc. I know the Loovent is
centrifugal, but the QuietAir is "axial high efficiency impeller" (from
the description). Do i stick with another cntrifugal model, or can i
switch to this axial one?

Centifugal means the air comes into the unit from the sides, axial means it
comes in from below (assuming the unit is ceiling mounted). Axial means you
can see into the fan from below, not for centrifugal. Which is best depends
where the vapour you're trying to extract is coming from.

Theo

Extractor Fan Replacement - 100mm to 150mm

Sorry, forgot to mention it is for a 2nd floor (of a 3 floor) flat so unsure how long or short the ducting is, or where it actually goes out to.

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For full context, visit https://www.homeownershub.com/uk-diy...m-3100269-.htm

Extractor Fan Replacement - 100mm to 150mm

Thanks very much for all of your input, its very helpful indeed. Ive decided to play it safe, replace like for like, so now looking around for boxy 100mm centrifugal fans that are hopefully not too expensive, around the 100-200 quid mark. Thanks again!

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For full context, visit https://www.homeownershub.com/uk-diy...m-3100269-.htm

Extractor Fan Replacement - 100mm to 150mm

On 23 Feb 2021 at 16:45:04 GMT, "Polskasweetie"
wrote:

Sorry, forgot to mention it is for a 2nd floor (of a 3 floor) flat so unsure
how long or short the ducting is, or where it actually goes out to.

It is probably best to assume a moderate length of duct then, because you need
a fan suitable for a duct as the common, cheaper ones will not work very well
at all with any significant length of duct (more than 400mm or so). The exact
length of duct will affect efficiency but if you don't know the length then it
it is reasonable to get one designed for ducted use so it will work even if
you don't know exactly how well.

--
Roger Hayter