For safer use of generator, you may want to get the Camco Gen-Turi system:
https://www.amazon.com/Camco-44461-Gen-Turi-Generator-Exhaust/dp/B000BUU5XG/ref=sr_1_3?crid=RB6U6JNTTO2I&dchild=1&keywords=rv+generator+exhaust+venting+system&qid=1630327466&sprefix=rv+generator+e%2Caps%2C197&sr=8-3
Shop around as you can probably get a better price than the current Amazon price, or find one slightly used. I recently picked one up just in case I need to run a generator while sleeping, and I also purchased an extra carbon monoxide detector for use in the bedroom.
If you have an Onan generator, their web site has a link for finding a nearby service facility, or simply do a Google search for generator service. Basic maintenance on a generator isn't that difficult (oil change, oil filter, plugs) and I've learned to do it myself. I did have to buy a oil filter wrench that helps me remove the filer as it is recessed on my generator. Supplies can be ordered directly from Onan or can be purchased online.