Performed 2 system heating maintenance. Checked amps, filters, cleanliness, drains, electrical, inducers, blowers, igniters, flame sensors, and safeties. Systems are heating to manufacture specifications. Concerns and suggestions 1. Suggest adding more water safety switches and doing a drain treatment. 2. Concerned about dust build up on the blowers. This causes unnecessary wear to happen to the blower motor because it is having to work harder to do its job and can result in failure. 3. Concerned about the inducer failing soon because it is not currently functioning correctly. The internal blades and catching the cage around it. This adds extra stress to the inducer and it will fail.