I'm fitting a maxx air fan today....screws or ct1 is the question

[Ads86]

Hello all

I'm using the rear sky light which is a prefect fit to just slide the max fan into. I'm then running a 12v connection straight from the fuse board in the garage.

Ive got some sikaflex for the maxx fan to sit on along with the screws that came with the unit. I'm always nervous about creating holes in the roof so I'm debating to just use ct1 to glue the new fan in and not using any screws at all.

It's strong as hell, waterproof and flexible. The only downside I can see is if I come to take the fan surround out and it's stuck on the roof. But I doubt I'd ever got back to a normal hatch so I'm not really worried about that.

Any thoughts? Or has anybody already done this with ct1?

Cheers

 

[oozzie]

Not done this myself but how was the old skylight held in? I’ve got a remis vista on mine which has a few cracks so got a heki to put in but don’t think the screw holes match up so will possibly be looking at the same as you. If the ct1 is that strong you might be ok.
Oozzie

 

[Roby2008]

I replaced a heki with a maxxfan, hole was the same size, screw holes for the maxxfan were different but scewed in anyway, plenty of Sika and all is well.

 

[Ads86]

I've gone with the ct1 approach. I really didn't want to put holes in the roof. My old roof vent seemed to clamp on from the interior surround.

I'll see how it goes, it's only been on a couple of hours and it feels solid already. They say it can withstand +120°c and -40°c.

 

[Raul]

If you are too worried, you can get an adapter for max fan, van and location specific. That way no worry about the screw holes.

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[Howard B]

I used both.

 

[delia]

I have fitted 2 Maxfans. On the last van used screws as per instructions but thought it was a bit of a messy bodge covering them. But it stayed on and didn't leak. On this van I took out the existing fan and fitted the Maxfan using sikaflex only, no screws. So far after 22k miles it has stayed on without leaks.

 

[fishplug]

I have fitted 2 Maxfans. On the last van used screws as per instructions but thought it was a bit of a messy bodge covering them. But it stayed on and didn't leak. On this van I took out the existing fan and fitted the Maxfan using sikaflex only, no screws. So far after 22k miles it has stayed on without leaks.

This mirrors my experience. Haven't done 22k in the new one yet, but it's done somwhere around 10k without issue.

As I understand it the new MaxxAir fans are shipped with a cowel that has dimples which you can drill if you want to screw it down but they've pretty much acknowledged that there's a wide enough area to put more than enough bonding to secure it without screws.

The only thing I would say is that I still put a wooden frame on the inside which both adds a bit of structure and rigidity to where you've just cut a big hole, but also gives you something to clamp against while your CT1 / Sikaflex / bonding agent of choice is curing.

A nice squeeze will ensure there's no chance of a leak. Lots of small clamps will give more even pressure than just four big ones. Think I used one big one per side and two more smaller ones. Might have been overkill, but I tend to over engineer stuff.

 

[ivorantony]

Yes I used both as well,