Hi all. I would like to buy a Hayward 100kbtu heater for my above ground pool. My pool is surrounder by deck. There is about 4 feet of space below the deck. The manual says not to put heater under the deck and the top should be unobstructed. Has anyone done this type of installation? How hot is the exhaust that blows out? Can I put a sheetmetal plate right below and to the side to block the exhaust from heating the bottom of deck boards and the pool wall? Any thoughts and advice is appreciated. Thank you