Air duct cleaning is happening every day in neighborhoods all over Portland and Vancouver. This short story should help with what to expect when scheduling your duct cleaning service. The vent cleaning in an 1800-2200 sq ft home takes two technicians three to four hours, it can be done by one tech but it would take longer. Using a Hepa filtered negative air machine is the EPA’s preferred method for duct cleaning. After separating each side of the HVAC system and attaching the negative air machine to one side either supply or return, the techs should then seal every vent in the home and starting with the duct as far away from the system as possible navigate air whips from each register in the home all the way back to the furnace. The rest of the work is done in and around the furnace itself and back from the return and supply plenums. The right duct cleaning companies will show you each step of the process and should be able to show you what comes from the ductwork and they should never add fees to the the original service. This said, there are no $99 or funnier yet $59 whole house duct cleaning specials, this is impossible for a company to maintain, there is just too much work involved in a full service. There are resources available to research the guys you can trust. You may check Angie’s List if you’re a member, if not, there is the Better Business Bureau or reviews on Yelp and Google+! The service is awesome and should be done once every 3-5 years. Good luck to all!