A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle.How much force is required to hold a 7.2diameter hose delivering 400 through a 0.77diameter nozzle?
My favorite for gluing almost anything to almost anything else are the Goop brand glues. For this you could use any of them Amazing Goop, Crafter's Goop, E6000, Quick Hold Goop, or even Shoe Goo. These dry slightly flexible and are completely permanent. You can get at least some of them in the adhesives aisle of almost any hardware store, crafts supplies store, discount department store, or home improvement store. They are totally safe when used as directed, but must be used as directed to be totally safe.
You are wise to be concerned about Carbon Monoxide (CO). That old furnace is inefficient, and likely it doesn't have the best sealed exhaust system for the unit. My question to you is Where does the furnace take its air from to fill the house above with warm air and where does it get its fresh air for combustion? If the unit has a cold air return from the unit above then they're not pulling air out of your living space. If the cold air return IS taking the air from your basement apartment then you are helping heat the unit above. To keep your space warm you definitely DON'T want your air going upstairs. But to gather more heat from that wasteful appliance, don't try anything that could pump CO into your rooms. Even (my opinion) leaving the door open is chancy. Hope this helps. 'av'a g'day mate. )
