MVHR ducting to outside

[Moira Niedzwiecka]

Brilliant, thanks for the detail Peter.

[gavztheouch]

Is it still recommend to put the inlet and outlet 2m apart? I see Zhender have a combined inlet/outlet that have the pipes right next to each other. I guess there will be a baffle arrangement to prevent cross contamination.

 

https://www.fastlec.co.uk/zehnder-2x160mm-right-hand-external-wall-grille?utm_campaign=smartsh&gad_source=1&gad_campaignid=17190426677&gbraid=0AAAAAD8Nz9f-3-LzDnHIlsuV-MleAAoms&gclid=CjwKCAjw6vHHBhBwEiwAq4zvA_Lglcqpz9-48JocAj6NXNiC2dTtCF737MkcyS5OSb9FuJkesldSKRoCFYcQAvD_BwE

[JohnMo]

11 minutes ago, gavztheouch said:

Is it still recommend to put the inlet and outlet 2m apart? I see Zhender have a combined inlet/outlet that have the pipes right next to each other. I guess there will be a baffle arrangement to prevent cross contamination.

 

https://www.fastlec.co.uk/zehnder-2x160mm-right-hand-external-wall-grille?utm_campaign=smartsh&gad_source=1&gad_campaignid=17190426677&gbraid=0AAAAAD8Nz9f-3-LzDnHIlsuV-MleAAoms&gclid=CjwKCAjw6vHHBhBwEiwAq4zvA_Lglcqpz9-48JocAj6NXNiC2dTtCF737MkcyS5OSb9FuJkesldSKRoCFYcQAvD_BwE

I use similar with zero issues.

[Kelvin]

38 minutes ago, gavztheouch said:

Is it still recommend to put the inlet and outlet 2m apart? I see Zhender have a combined inlet/outlet that have the pipes right next to each other. I guess there will be a baffle arrangement to prevent cross contamination.

 

https://www.fastlec.co.uk/zehnder-2x160mm-right-hand-external-wall-grille?utm_campaign=smartsh&gad_source=1&gad_campaignid=17190426677&gbraid=0AAAAAD8Nz9f-3-LzDnHIlsuV-MleAAoms&gclid=CjwKCAjw6vHHBhBwEiwAq4zvA_Lglcqpz9-48JocAj6NXNiC2dTtCF737MkcyS5OSb9FuJkesldSKRoCFYcQAvD_BwE

Similar to ours. No issue at all. Nice and neat. 

[Mike]

2 hours ago, gavztheouch said:

Is it still recommend to put the inlet and outlet 2m apart?

Yes, unless have a special terminal such as the Zhender.

[Nickfromwales]

13 hours ago, gavztheouch said:

Is it still recommend to put the inlet and outlet 2m apart? I see Zhender have a combined inlet/outlet that have the pipes right next to each other. I guess there will be a baffle arrangement to prevent cross contamination.

 

https://www.fastlec.co.uk/zehnder-2x160mm-right-hand-external-wall-grille?utm_campaign=smartsh&gad_source=1&gad_campaignid=17190426677&gbraid=0AAAAAD8Nz9f-3-LzDnHIlsuV-MleAAoms&gclid=CjwKCAjw6vHHBhBwEiwAq4zvA_Lglcqpz9-48JocAj6NXNiC2dTtCF737MkcyS5OSb9FuJkesldSKRoCFYcQAvD_BwE

My PH design guy says 1000mm apart is absolutely fine, and that is fortified in my opinion when you see combination vents doing both the 'inny' and the 'outy'.

 

No need for 2m afaic, and I have fitted a lot of MVHR systems successfully in the last decade+ with excellent results and feedback from clients who have then moved in and are living with the systems.

[gavztheouch]

My house is 210m2. Anyone else have a similar m2 and if so what diameter of pipe did you use for the external piping. Zhender have a pipe that is pre insulated I think it is 160 internal and around 250mm external. 
 

im also going for wood cladding. It’s open rainscreen so I need to make sure I’m weather tight coming through the membrane. What did you use here, I’m thinking an epdm grommet if they come big enough or possible just tape but I think that is always harder than a grommet.

[JohnMo]

21 minutes ago, gavztheouch said:

My house is 210m2. Anyone else have a similar m2 and if so what diameter of pipe did you use for the external piping. Zhender have a pipe that is pre insulated I think it is 160 internal and around 250mm external. 
 

im also going for wood cladding. It’s open rainscreen so I need to make sure I’m weather tight coming through the membrane. What did you use here, I’m thinking an epdm grommet if they come big enough or possible just tape but I think that is always harder than a grommet.

You need to do the pressure drop calculation really. Depends on flow rate, length and number of bends in the duct. But would suspect 160mm is fine and 250mm overkill.

 

I just taped between membrane and duct (foam ducts)

[Nickfromwales]

3 hours ago, JohnMo said:

You need to do the pressure drop calculation really. Depends on flow rate, length and number of bends in the duct. But would suspect 160mm is fine and 250mm overkill.

 

I just taped between membrane and duct (foam ducts)

160mm insulated is 250mm finished, external dia, as above. Not a 250mm duct   

[Nickfromwales]

@gavztheouch

 

https://www.cableglandsuk.com/products/dafa-renovation-grommet-airtight-sealing-for-passivhaus?_pos=1&_sid=a43c395d4&_ss=r&variant=46767281373408