what outside vent?

[CalvinHobbes]

Hello again, we have a Vent-Axia Lo-Carbon Sentinel Kinetic B Plus and not sure what is the best vent to put outside?

[CalvinHobbes]

bump

[JohnMo]

Just choose one to suit your needs.

 

My choice will not be yours.

[dpmiller]

just be mindful that some have quite a fine mesh grille that you'll need to access and clean, if you don't remove it beforehand...

[Gone West]

Make sure the vent you choose has at least the same flow area that the pipe has. It's a bad idea to restrict in any way the air flow into the unit. The main restrictions can be 90 degree bends, which slow the air flow, and/or insect screens, which reduce the area.

[Nickfromwales]

The basic grilles are flat with louvred slots, but we fit a lot of the ones that project a little, with a boxed section, and the outlet faces down and out at an angle. These seem to suffer less from windy days etc, but it may not be an issue if the elevation here isn’t hammered by weather.

 

Is that duct running downhill to meet the outside wall? If not then I’d suggest not going for the 1st option I mention as wind-driven rain can get in there. 
 

Also, get some CT1 / other non-silicone sealant and seal around the duct before fitting the grilles  

[Super_Paulie]

52 minutes ago, Nickfromwales said:

Also, get some CT1 / other non-silicone sealant and seal around the duct before fitting the grilles  

out of interest Nick, why non-silicone? im about to put a vent in for my downdraft hob this summer so will be in a similar situation. 

[Nickfromwales]

19 minutes ago, Super_Paulie said:

out of interest Nick, why non-silicone? im about to put a vent in for my downdraft hob this summer so will be in a similar situation. 

Silicone had a limited life, and should only be used for cosmetic stuff tbh. There are modified version used, for eg, in the glazing industry, but you ‘seal’ with a sealant afaic  much as you’d never use / see silicone around door and window frames (externally).

 

Silicones can’t be painted either.

[Nickfromwales]

21 minutes ago, Super_Paulie said:

im about to put a vent in for my downdraft hob

No MVHR? With MVHR you’d recirculate into the room not dump it outside. 

[Nickfromwales]

1 hour ago, Gone West said:

Make sure the vent you choose has at least the same flow area that the pipe has. It's a bad idea to restrict in any way the air flow into the unit. The main restrictions can be 90 degree bends, which slow the air flow, and/or insect screens, which reduce the area.

We’re using these mostly,

 

(random internet grab) 

 

 

[Super_Paulie]

17 minutes ago, Nickfromwales said:

No MVHR? With MVHR you’d recirculate into the room not dump it outside. 

nope, renovation is not that grand. Need to vent outside to please BC in this instance.

[Nickfromwales]

2 hours ago, Super_Paulie said:

nope, renovation is not that grand. Need to vent outside to please BC in this instance.

Make sure it's a decent sized duct to avoid the noise of the fan buffeting against a poor routed / too small one. Fans run much quieter with a bit of forethought  

[Gone West]

3 hours ago, Nickfromwales said:

We’re using these mostly,

They look good, as long as the rectangular area, minus the mesh area, is larger than the circular area, no problem. I did my build a good few years ago and there wasn't so much choice, so I made my own. It was ok for me because the vents were under the verandah and well protected.

[Nickfromwales]

2 minutes ago, Gone West said:

They look good, as long as the rectangular area, minus the mesh area, is larger than the circular area, no problem. I did my build a good few years ago and there wasn't so much choice, so I made my own. It was ok for me because the vents were under the verandah and well protected.

Yes, CSA is matched or exceed, plus I like these as they deflect a bit of the wind. I much prefer going up through a roof from an upper floor plant room, but you can't always get that in. 

[Gone West]

This is a copy of a post I put on here seven years ago which may be of interest.

 

When I was researching into how to install MVHR around eight or nine years ago I made a list of rules I found relating to connecting the unit to the outside. I'm sure these are not exhaustive and nor are they prescriptive, but it's what I used to install mine.

1. The inlet and outlet grilles should be 3m apart to prevent cross contamination of air. 3m was the distance I found mentioned most often.

2. The inlet and outlet grilles should be high enough (2m) to prevent interference by animals or children.

3. The inlet and outlet grilles should be on the same wall so they are affected equally by the wind.

4. The free flow area of the grill including insect screen should be at least as great as the cross sectional area of the duct.

5. The duct should be smooth wall to reduce air flow restriction.

6. Any ducting bends should be large radius of curvature or two 45 degree bends to reduce air flow restriction.

7. The ducting should slope downwards slightly to ensure any moisture drains to the outside.