What flue cap for windy spot?

Call me Al

As the title says, we are wondering which flue cap is best for our twin walled stainless steel flue.
We have a Chinese cap that has blown off twice in very strong winds. We used a rivet gun after the first time to reconnect the top plate to the frame after the first time. The wind was so strong it actually ripped this riveted piece off the frame, leaving the frame attached to the flue, later in the year.

We know we need to replace the cap but we don't know what to replace it with.

FYI it is all attached to the gable of a dormer bungalow, and reaches almost to the top of the roof. We have a good draw on the stove, never have problem lighting it, and have only had issues a couple of times in two years with a downdraft.

Any advice appreciated before we waste more money on it.

Dtp79

Call me Al wrote: »

As the title says, we are wondering which flue cap is best for our twin walled stainless steel flue.
We have a Chinese cap that has blown off twice in very strong winds. We used a rivet gun after the first time to reconnect the top plate to the frame after the first time. The wind was so strong it actually ripped this riveted piece off the frame, leaving the frame attached to the flue, later in the year.

We know we need to replace the cap but we don't know what to replace it with.

FYI it is all attached to the gable of a dormer bungalow, and reaches almost to the top of the roof. We have a good draw on the stove, never have problem lighting it, and have only had issues a couple of times in two years with a downdraft.

Any advice appreciated before we waste more money on it.

Probably a H vowel if its a downdraft problem but that's not the real issue I see. Contact MI flues directly and see what they think

corkgsxr

Theres one you can get if you imagine you quartered a circle and reversed each piece so theres 4 points and 4 grooves.

There very good for downdraught and high winds

shane0007

H cowl is best.

Call me Al

Thanks for all the feedback.

We had thought that maybe a spinning cowl would have been suitable for something like this Our neighbour has one of those but it isn't as high as our chimney, and is more sheltered, so wouldn't catch as much wind.

But obviously not!

corkgsxr

Call me Al wrote: »

Thanks for all the feedback.

We had thought that maybe a spinning cowl would have been suitable for something like this Our neighbour has one of those but it isn't as high as our chimney, and is more sheltered, so wouldn't catch as much wind.

But obviously not!

They get clogged and stop

shane0007

corkgsxr wrote: »

They get clogged and stop

True but it's the ball bearings that rust & then seize.

Robbie.G

shane0007 wrote: »

True but it's the ball bearings that rust & then seize.

The op is asking which would be better to stay on not for downdrafts.Most cowls are ****e they don't cure anything.The H cowl is probly the best cowl out there for downdrafts but it also the cowl that is most likely to cause the biggest blockages as
it can't be swept even when removed

Call me Al

Ok thanks.

So the reality is that they both, spinning and H, have disadvantages to them.

But at least they won't blow off. We've had 2 small birds come down the flue when it's been exposed so the sooner it's recovered the better.