Some advice regarding 125mm hole for cooker hood fan please?

[egg67]

No l used a 105 but that was because I had one, 107 will do the job just as good, you just do not want it too Tight on the ducting as it makes it hard to get it in, the cover will hide the hole bit off sand and cerment and rember to drill from both sides not just from one

 

[HappyHippyDad]

Think most of the cooker hoods come with an adaptor from 125 - 100mm. Ones I have fitted did. I would not drill 125 hole, the house might fall down.

Edit; Manrose Round Central Reducer White 125-100mm - http://www.NoLinkingToThis/p/manrose-round-central-reducer-white-125-100mm/10684?kpid=10684&gclid=Cj0KCQjwoZTNBRCWARIsAOMZHmHglSc5tjH3uEKTtlLv9cm30Meza_vOqGB8JIICplkEM8463N-oSBUaAs4KEALw_wcB&gclsrc=aw.ds&dclid=CJzElviM_NUCFU60UQodLBUNLQ

This seems like the best option but if the the motor is designed to remove air through a 125mm hole will it not be straining to remove through a 100mm hole?

 

[Pete999]

This seems like the best option but if the the motor is designed to remove air through a 125mm hole will it not be straining to remove through a 100mm hole?

 

[Pete999]

Shouldn't think it will make any difference

 

[egg67]

No the moter is designed so that it can push air a certain Length from hood Manufacturers allow for bends so all will be fine, if using flexible duct make shore you pull it out straight first and then fit it

 

[Midwest]

This seems like the best option but if the the motor is designed to remove air through a 125mm hole will it not be straining to remove through a 100mm hole?

Think the 90' bend in the ducting would have a worse effect.

 

[HandySparks]

.... and rember to drill from both sides not just from one

Why?

 

[HandySparks]

.... and rember to drill from both sides not just from one

Why?

 

[HandySparks]

This seems like the best option but if the the motor is designed to remove air through a 125mm hole will it not be straining to remove through a 100mm hole?

It won't strain the motor (might even reduce the load slightly, depending on the characteristics of the motor) but it will reduce the flow for a given fan speed (as will more duct length or bends). Whether this matters to you or your customer is hard to judge.

 

[Pete999]

Why?

To stop break of the material you are drilling through