Insect screen mesh for vent fan outlet

[AnthonyL]

The insect mesh for the outlet of my ducted shower fan is broken (no -
I don't know how or why, the fan was broken too but I've just replaced
that with a 100m Xpelair - which came with a nice but unmeshed flapped
outlet).

The outlet vent is 5.25" square. Ideally I just want a similar sized,
black, piece of screen mesh which will let air out, keep insects out
and will not rot or corrode.

I must be searching for the wrong thing but I can find rolls of the
stuff or some vents with it inbuilt but not some sensibly priced/sized
pieces. Any pointers please?

--
AnthonyL

[Tim Lamb]

In message <574c1a10...@news.eternal-september.org>, AnthonyL
<nos...@please.invalid> writes

Surely if it is *flapped* they could only get in by flying up wind?
Unless you want to keep them in the house?
>

--
Tim Lamb

[jim]

nos...@please.invalid (AnthonyL) Wrote in message:

The mesh gets bunged up with fluff and the fan
won't extract...
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

[Dave Liquorice]

On Mon, 30 May 2016 13:01:35 +0100 (GMT+01:00), jim wrote:

> The mesh gets bunged up with fluff and the fanwon't extract...

On a shower fan? Well it might but it'll take a while, unlike that on
a tumble dryer...

--
Cheers
Dave.

[Dave Liquorice]

On Mon, 30 May 2016 12:31:17 +0100, Tim Lamb wrote:

> Surely if it is *flapped* they could only get in by flying up wind?

On the ones I've looked at the flaps aren't particulary close fitting
so small creatures could get in.

As for the OPs problem:

1) See if Expelair or anybody else does a flapped vent with screen. I
think the cowled and flapped vents I have here (somewhere) have a
screen as well, probably Marley.

2) Look at all screened air vents and see if the screen could be
removed and reporpussed.

--
Cheers
Dave.

[Phil L]

AnthonyL wrote:
> The insect mesh for the outlet of my ducted shower fan is broken (no -
> I don't know how or why, the fan was broken too but I've just replaced
> that with a 100m Xpelair - which came with a nice but unmeshed flapped
> outlet).
>

The flaps are closed when the fan's not in use, this means no flies can get
in.

> The outlet vent is 5.25" square. Ideally I just want a similar sized,
> black, piece of screen mesh which will let air out, keep insects out
> and will not rot or corrode.
>
> I must be searching for the wrong thing but I can find rolls of the
> stuff or some vents with it inbuilt but not some sensibly priced/sized
> pieces. Any pointers please?

When the flaps are open, the fan is blowing air from inside to outside, this
means no flies can get in.

[spuorg...@gowanhill.com]

On Monday, 30 May 2016 11:52:19 UTC+1, AnthonyL wrote:
> I must be searching for the wrong thing but I can find rolls of the
> stuff or some vents with it inbuilt but not some sensibly priced/sized
> pieces. Any pointers please?

Ebay is often a good place for small pieces of something.
Eg 1 x 1.2 m for £1.79 delivered
http://www.ebay.co.uk/itm/191876530206
includes free velcro tape

Or stainless steel 9" x 9" for £5
http://www.ebay.co.uk/itm/272251289332

Owain

[jim]

"Dave Liquorice" <allsortsn...@howhill.com> Wrote in message:

Yup on shower fans.

Tumble dryers should have their own filters in the machines with
stern notes about cleaning before every use ... -ask the
wife?

[The Natural Philosopher]

On 30/05/16 16:29, Chris Hogg wrote:

> Cannibalise a kitchen plastic sieve, but don't tell SWMBO! "No dear, I
> don't know where it is. Are you sure you didn't put it in the bin?"
>
http://www.meshdirect.co.uk/fly-screen-insect-mesh/


--
The biggest threat to humanity comes from socialism, which has utterly
diverted our attention away from what really matters to our existential
survival, to indulging in navel gazing and faux moral investigations
into what the world ought to be, whilst we fail utterly to deal with
what it actually is.

[soup]

On 30/05/2016 16:37, The Natural Philosopher wrote:
> On 30/05/16 16:29, Chris Hogg wrote:
>> On Mon, 30 May 2016 10:52:16 GMT, nos...@please.invalid (AnthonyL)
>> wrote:
>>
>>> The insect mesh for the outlet of my ducted shower fan is broken (no -
>>> I don't know how or why, the fan was broken too but I've just replaced
>>> that with a 100m Xpelair - which came with a nice but unmeshed flapped
>>> outlet).
>>>
>>> The outlet vent is 5.25" square. Ideally I just want a similar sized,
>>> black, piece of screen mesh which will let air out, keep insects out
>>> and will not rot or corrode.
>>>
>>> I must be searching for the wrong thing but I can find rolls of the
>>> stuff or some vents with it inbuilt but not some sensibly priced/sized
>>> pieces. Any pointers please?
>>
>> Cannibalise a kitchen plastic sieve, but don't tell SWMBO! "No dear, I
>> don't know where it is. Are you sure you didn't put it in the bin?"
>>
> http://www.meshdirect.co.uk/fly-screen-insect-mesh/

He's looking for about a foot square of the stuff not a 5M roll.

Every flapped outlet I have seen is close enough fitting to prevent
insects flying in. Perhaps they'd be able to crawl in but no houses are
hermetically sealed (something you'd need to keep ALL insects out).

[Tim Watts]

On 30/05/16 21:24, soup wrote:
>
> Every flapped outlet I have seen is close enough fitting to prevent
> insects flying in. Perhaps they'd be able to crawl in but no houses are
> hermetically sealed (something you'd need to keep ALL insects out).

My soffit vent has a mesh insert - something like this:

http://www.ebay.co.uk/itm/S/141330179058

[Tim+]

Can't really see the relevance of a soffit vent mesh to an extractor fan.
Very different functions!

Tim

--
Trolls and troll feeders go in my killfile

[Tim Watts]

Well, it stops things nesting there...

[spuorg...@gowanhill.com]

On Monday, 30 May 2016 23:14:16 UTC+1, Tim Watts wrote:
> > Can't really see the relevance of a soffit vent mesh to an extractor fan.
> > Very different functions!

> Well, it stops things nesting there...

And last year I had a bird nesting in my extractor fan vent. It's no longer used and was plasterboarded over on the inside, but not sufficiently meshed on the outside.

I just discovered the inside bit today and it should be getting foamed up later this week.

Owain

[Brian Gaff]

I was surprised how much putting this stuff over a fan outlet reduced the
flow when I put a fan in to keep my workshop cool many years ago.
Maybe this is why many do not have it these days.
On my air bricks I used some small sized expanded ally mesh which appeared
to have been anodised. Yes it had to be cut and clamped in little frames,
but seems to have survived for many years..
I think originally it came from Wickes or however one spells it.
Brian

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"AnthonyL" <nos...@please.invalid> wrote in message
news:574c1a10...@news.eternal-september.org...

[Brian Gaff]

No the vent might be needed to be open with no fan running at times. IE
ventilation but no fan.

Brian

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"Tim Lamb" <t...@marfordfarm.demon.co.uk> wrote in message
news:pT1T3PYF...@marfordfarm.demon.co.uk...

[Tim+]

And how are they going to get past the flap? Mesh is absolutely fine for a
diffusion vent but will dramatically impair the function of a forced flow
fan if one tries to use a mesh small enough to keep insects out.

Tim

--
Trolls AND TROLL FEEDERS all go in my kill file

[Tim Watts]

On 31/05/16 08:16, Tim+ wrote:
> Tim Watts <tw_u...@dionic.net> wrote:
>> On 30/05/16 21:58, Tim+ wrote:
>>> Tim Watts <tw_u...@dionic.net> wrote:
>>>> On 30/05/16 21:24, soup wrote:
>>>>>
>>>>> Every flapped outlet I have seen is close enough fitting to prevent
>>>>> insects flying in. Perhaps they'd be able to crawl in but no houses are
>>>>> hermetically sealed (something you'd need to keep ALL insects out).
>>>>
>>>> My soffit vent has a mesh insert - something like this:
>>>>
>>>> http://www.ebay.co.uk/itm/S/141330179058
>>>>
>>>
>>> Can't really see the relevance of a soffit vent mesh to an extractor fan.
>>> Very different functions!
>>>
>>> Tim
>>>
>>
>> Well, it stops things nesting there...
>>
>
> And how are they going to get past the flap? Mesh is absolutely fine for a
> diffusion vent but will dramatically impair the function of a forced flow
> fan if one tries to use a mesh small enough to keep insects out.
>
> Tim
>

What flap?

[Nightjar]

On 30-May-16 9:24 PM, soup wrote:
...

> Every flapped outlet I have seen is close enough fitting to prevent

> insects flying in...

The standard for stopping flying insects getting into water supplies is
an aperture no larger than 57 microns. You must have seen some
particularly well fitting flapped outlets.

--
--

Colin Bignell

[Nightjar]

On 31-May-16 7:38 AM, Brian Gaff wrote:
> I was surprised how much putting this stuff over a fan outlet reduced the

> flow when I put a fan in to keep my workshop cool many years ago...

The mesh I use on insect screens for water supplies has only 40% open
space, so the screen needs to be 2.5 times larger than the
cross-sectional area of the pipe it is fitted to in order to maintain
full flow rates.


--
--

Colin Bignell

[Tim+]

From the OPs first post: " which came with a nice but unmeshed flapped
outlet".

[AnthonyL]

On Mon, 30 May 2016 07:48:51 -0700 (PDT), spuorg...@gowanhill.com
wrote:

>On Monday, 30 May 2016 11:52:19 UTC+1, AnthonyL wrote:
>> I must be searching for the wrong thing but I can find rolls of the
>> stuff or some vents with it inbuilt but not some sensibly priced/sized
>> pieces. Any pointers please?
>
>Ebay is often a good place for small pieces of something.

>Eg 1 x 1.2 m for =C2=A31.79 delivered

>http://www.ebay.co.uk/itm/191876530206
>includes free velcro tape
>

>Or stainless steel 9" x 9" for =C2=A35
>http://www.ebay.co.uk/itm/272251289332
>

I tried Ebay - honest - never came up with anything as handy as this -
thank you.

--
AnthonyL

[AnthonyL]

On Tue, 31 May 2016 10:46:27 -0000 (UTC), Tim+ <tim.d...@gmail.com>

OP here - being lazy the existing outlet, already in situ, has the
broken mesh and no flaps and I was simply going to replace the mesh.
No idea how it comes to be broken.

The new fan comes with a flapped outlet which means I have to remove
the whole of the old outlet, not just the grill, and then no doubt
find some silly issue with where to fasten the new outlet.

A bit of nice mesh should take minutes, the latter, with my luck and
lack of skills, likely to take a whole morning.

Sorry for any confusion though if you read the OP it is as I said.


--
AnthonyL

[AnthonyL]

On Tue, 31 May 2016 11:10:33 +0100, Nightjar <c...@bignell.me.uk>
wrote:

Good points thanks. How much do flaps impede the flow?

--
AnthonyL

[Tim Watts]

I was referring to mine :)

As it's a downwards facing soffit vent, it's open all the time - and the
fan's an axial in line, so that doesn't have one either (never had a
problem with wind blowing in with that arrangement).

But point taken WRT to the OP...

[soup]

On 31/05/2016 11:06, Nightjar wrote:
> On 30-May-16 9:24 PM, soup wrote:
> ...
>> Every flapped outlet I have seen is close enough fitting to prevent
>> insects flying in...
>
> The standard for stopping flying insects getting into water supplies is
> an aperture no larger than 57 microns.

Flying? Doubt it.

Crawling? Pretty conceivable see my PP (But NOBODY lives in a completely
sealed house).

[Vir Campestris]

On 31/05/2016 12:33, AnthonyL wrote:
> Good points thanks. How much do flaps impede the flow?

Depends.

When two successive house painters have covered the light plastic flaps
with masonry paint - quite a lot.

(I gave up. There's a flap on the fan too, so I fixed the outside ones
open at 45 degrees, enough to let air through but keep rain mostly out)

Andy