All methods require

All methods require mechanical agitation devices to dislodge debris adhered to
interior HVAC system surfaces, such that debris may be safely conveyed to
vacuum collection devices. Acceptable methods will include those, which will not
potentially damage the integrity of the ductwork, nor damage porous surface
materials such as liners inside the ductwork or system components.
(D) Cleaning of Coils
1. Any cleaning method may be used which will render the Coil Visibly Clean and
capable of passing Coil Cleaning Verification (see applicable Industry Standards).
Coil drain pans shall be subject to Non-Porous Surfaces Cleaning Verification.
The drain for the condensate drain pan shall be operational. Cleaning methods
shall not cause any appreciable damage to, displacement of, inhibit heat transfer,
or erosion of the coil surface or fins, and shall conform to coil manufacturer
recommendations when available. Coils shall be thoroughly rinsed with clean
water to remove any latent residues.