Modern ones with electric ignition probably dont.when walking into a kitchen I could tell whether it was gas or elec range before I looked if it hadnt been redecorated in 10-15 years,,,and most rentals are not

This includes the outside termination and the connections at and internal to the furnace.Combustion gases must be analyzed and compared to the unit specifications.The blower access door needs to be checked to make sure it makes a tight seal at the furnace.The fresh air intake grills and louvers need to be checked for blockage.The heat exchanger needs to be inspected for rust and corrosion.The burners need to be checked for proper ignition, burner flame and flame sense.The drainage system needs to be checked for blockage and/or leakage.

This process has really re-ignited my passion for reading for pleasure, not just medical texts or research journal articles.I do want to take just a moment to say thanks to all of the contributors to this website.

It had a bad ignition and no floorboard in the driverside back.

Fuel oil is not especially volatile, but it stinks and if it does ignite, the conflagration will be formidable.

Now even when it's on minimum with a blower it generates way too much heat & it lacks a thermostat control unit.Also if you get a remote go with direct hard wired ignition as those with batteries in the log set will need to be replaced every year & they are tough to get to.

I speak very highly of you guys and this site has been the spark that ignited my dream I have turned into a real company!

It's not likely dangerous - while Great stuff is flammable - the hot air in your duct line will not ignite it.What may happen is the foam will eventually loosen over time with the repeated expansion and contraction of the vent pipe and the seal will fail.  

We learned a great quote this last weekend that ignited us to get more serious with the laid back real estate investment business.

I buy cars with push button ignitions so I don't have to take a key out and turn it.