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Show , Friday January IS 199, THE DAILY HERALD, Hmsc Magane J'PtgeH Solving the problem of squealing, squeaking dryers i By POPULAR MECHANICS For AP Special Features Q: My Whirlpool gas dryer squeals and squeaks when it first starts up and runs for 5 or 10 minutes. Then the racket goes away and the machine runs like new. I lubricated the drum drive belt and drum support cleaned the rear groove in the drum, all without improvement. Please help. A: You are on the right track. Set the temperature control to air fluff then unplug the dryer from its ''- -power source. Next, remove the drive belt from the motor by pulling the idler pulley back toward the motor and slipping the belt off the motor drive pulley. Slowly release the tension on the idler pulley assembly. Remove it from the dryer. Plug the machine back into its the idler wheel, roller shafts, and I - power source and test-ru- n the dryer. If you get the squealing noise, it's probably coming from the motor bearings, which are factory lubricated and cannot be oiled. If there is no squeal with the belt off, then it's either the idler pulley assembly, or the two support rollers. If your dryer is old, we suggest you replace all three parts. You should also give the appliance a good vacuuming inside and check the condition of the belt. This is a good time to replace it if it shows signs of cracking or fraying. Q: What are the benefits of having a fresh air intake on a gas fired forced air furnace? I'm especially interested in the health benefits. We live in a tight house in a very cold region. A: If the house is very tight, and there is minimal outside air infiltration, a fresh air intake is necessary to ensure the eas furnace. works at peak efficiency. Specifically, a fresh air intake helps ensure complete combustion of the gas. It also reduces the chance that carbon monoxide from the furnace will the house, a phenomenon in tight houses known as back drafting. A fresh air intake is still a good idea in houses that are not very tight. In this case, the air intake conserves energy by ensuring that combustion in the furnace does not rely on the air in the house, which has already been heated. The cycle works "this way. There is generally a negative pressure in a house. When heated air is used in the combustion process, it goes up the chimney as waste gas. This increases the negative pressure since the air in the house is being used to burn the gas. In a house that's not very tight, this causes more cold air infiltration. ThU rnlH air must be heated. er , which uses up more energy. An air intake uses unhealed air to ensure combustion. Also, the negative pressure in the house does not increase because the air inside it is not used for combustion. For most homeowners, health problems resulting from indoor air contaminants are minimal. The typical American house built within the last 30 years has an average infiltration rate of .4 to 1 air change per hour. The air exchange rate for the living areas of the house should be .35 air changes per hour. L m L nr- Hlpiito Q HiRhlond . ' -- leave you with 6 heavy heart. Heart Association inamfin QSoiitli ; : ; ? t ! : a American Heart Association 1992, American OapIofoH 1 foods can High-fa- t, , - . Reader LIGHTEN UP. SDrinmriBo 1 a question, write to Mechanics, Service Bureau, 224 W. 57th St., New York, N.Y. 10019. The most interesting questions will be answered in a future column. However, some of the newer, houses have an air exchange rate of . 1 air changes per hour. Without ventilation, this could result in stagnant indoor air with more than the usual amount of pollutants and bacteria. To prevent this, you must increase the ventilation. 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