Ok it's supposed to be in the 1st 7 chapters..When Mrs. Maude's house chatches on fire who places the blanket around Scout While she is freezing in the night cold air? I don't remember reading that part can someone please help me! The plus side is its multiple choice: Miss Stephanie Boo Radley Dill Jem
Schedule 40 fittings would be weld fittings that match schedule 40 pipe. Class 150 fittings could be ANSI 150 flanges or they could be malleable iron fittings which are usually threaded. They could also be stainless steel fittings. See the link below.
The amount of air leaking through the fittings is probably minimal so it won't be a big deal as far as safety. It does seem silly to fire someone over that but I wasn't there.
I would strongly suggest you look up the landlord/condo contract and find out legally what is supposed to be happening here and specifically what the laws are. It's very possible, for insurance reasons, that you could be incorrect. This is not so much an etiquette problem; not now anyway, it could have been before the battle of wills, but now I'd say you need legal help, and if you do not find the specific laws and contracts about this, I think you should seek professional counsel. Do you really want to spend all those lawyer's fees? or could you just go get a new detector or battery at the store and spare yourself a lot of hassle and expense?