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Due to the laws of physics in that a 2” diameter vacuum hose leaves behind all large diameter items, no airflow improvement is ever
realized after the service is performed. Clumsy shop vac hoses usually cannot effectively clean through most furnaces burners, hence the ash, dirt, carbon and dust that can be found in these burners typically stay in the burners. This results in no efficiency improvement when cleaning out the burners, because the shop vac hose could not fit inside of the burners to properly clean it as compressed air or nitrogen can. Most ventilation and or HVAC systems have portions of ductwork that is not easily accessible due to portions of the ductwork being drywall finished around. Should this be the case at any given jobsite, a consumer and or customer must realize that a large portion of ductwork will not be cleaned as a result when the contact cleaning method of air duct cleaning is employed. Typically a shop vac hose can only reach up to 15’ before the hose just curls up. Some trunk lines may stretch out to over 100’ in distance, which means 15’ would be cleaned and 85’ would go untouched. 90
degree turns will almost always make the shop vac end its descent in cleaning down a pipe because the shop vac hose cannot be turned without physical intervention. A greater risk of disconnecting pipes occurs due to the physical nature of the contact cleaning method. Also if any home security wiring, telephone wires or low voltage wiring is ever present in the ductwork, the physical nature of the contact cleaning method in air duct cleaning will increase the chances in breaking such wires, whereas air washing will not compromise such wires in any shape way or form. Most contact cleaning companies will recommend that you should have your air ducts cleaned out every year or two, because they know they left enough debris in the ductwork to try to get at it again in a year or two.
