Hi all, we’ve got a multi fuel burner for our NB (Vulcan 5.2kw) as it is quite a small stove and we’d like some space on top for a kettle and casserole dish or whatever we were hoping to make use of the vent on the back to attach the flue to. We’d have to have a 90 degree (?) bend to ensure that the flue could then travel straight up and out. Is this allowed with BSS rules as early research seems to indicate we’re not allowed a bend more than 30 degree. Worth noting we’re pribably going to double insulate the flue and our JB boat roof is GRP onto steel if that makes any difference. Thanks in advance!!