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One of the most common problems with hvac equipment is poor ventilation. This problem makes your hvac equipment work like inefficient outdated models which can waste plenty of your money. The two most common reasons behind poor venting: inadequate duct sizing as well as a dirty return air filter. 1. Audacity: Audacity is probably the most widely used and free audio recording software programs, capturing the hearts of both sound engineers and casual audio mixing crowd. It can be used for audio recording from microphone, file conversion, cutting, copying and editing sound files. Its supported audio file formats include MP3, WAV, AIFF and OGG Vorbis. The Beta 1.3.13 is its latest version, that is now appropriate for windows 7, Windows Vista and Mac OS X 10.6. The name Opal comes from three sources. One is the Latin word "Opalus". The second one is from your Greek word "Opalliois" meaning a difference of colour lastly from your ancient Sanskrit word "Upala" meaning precious stone. If one speaks of gemstone over these tongues the saying Opal would be Opallious upala, which suggests precious stone.Which shows of assorted colours when shifted against light.