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Warning Signs and How To Avoid A Scam

Resources to help avoid Air Duct Scams:

Business License and Insurance

We are a registered S-Corp based out of Savage, Mn. We are licensed to do business in the state of Minnesota. We are also bonded and insured to protect ourselves and homeowners from any errors and omissions. Lastly, we are certified from NADCA with three certifications: ASCS, VMT, & CVI. We also hold the Chimney Safety Institue of America's  Certified Dryer Exhaust Technician (C-DET) certification.

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Common signs of an unlicensed operator

Red Flags

  • Lack of business name
  • Lack of business license
  • Lack of business insurance
  • Lack of certifications


We strive for excellent and transparent lines of communication. You call or text and we reply; not a suspicious Facebook profile or out of state number from a call center. We are local. We want our customers to know exactly how much they are paying, what they will be receiving for their money, and what processes we use for the job. There is no such thing as a bad question. We hope to educate you on the process from the initial call to when we complete the job and answer any questions along the way.

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Communication can be an indicator when dealing with companies that will provide sub-standard service.

Red Flags:

  • Unable or unwilling to answer questions about the process
  • Cannot give a rough estimate over the phone
  • Slow to reply, return calls, messages, or emails
  • Call center services/out of state numbers
  • Facebook profiles disappear after they messaged you.


Reviews can make or break a business in any industry. We are proud to have a majority of 5-star reviews. If a customer has an issue or question, even if it is outside of our field, we go above and beyond to help resolve any problems. We have a strong, trusted network of businesses we can refer to for any of your needs.

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Properly vetting a company can go a long way to determining what kind of service you will receive.

Red Flags

  • Poor reviews
  • Lack of reviews
  • Cross-posted reviews
  • Better Business Bureau complaints
  • Minimal social media profiles
  • Phony social media accounts
  • Photos of other companies work/equipment

Equipment and Specialty

At Gray Duct Technologies, we use some of the best equipment and cleaning processes available. Air duct, dryer vent cleaning, and A/C cleaning are our main focus. It is all we do! Our negative air machine pulls close to 5,000 cubic feet of air per minute with the HEPA filters in place. We combine this with up to 175 psi of compressed air through each of your air ducts using a variety of agitation tools such as air whips, directional nozzles, and rotary brush systems. This variety of tools helps us complete the job regardless of what issues may arise.

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Proper industry equipment and practices are vital to proper duct cleaning.

Red Flags

  • Under-powered equipment/Shop Vacs with brushes
  • They don't clean your furnace/blower wheel
  • Secondary service (carpet cleaning company doing air duct cleaning)
  • Doesn't create access holes in both trunk lines
  • Only cleans one trunk line or neither
  • Different levels of cleaning: non-negative air type
  • Claims your house is clean in one hour or less


We believe in upfront and honest pricing. We want our customers to know exactly what they are paying. We don’t believe in hidden fees or charges. We charge based on the size of your home for the full system. We will not make you walk around your home counting vents. When you have a company that cleans the right way, they understand how important it is to clean the full system and not charge “per vent.”

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Upfront pricing is crucial. Nobody likes to be hit with unknown fees or surcharges. Understand the common pricing misrepresentations used can be very helpful in your search for a cleaner home.

Red Flags:

  • “$99-$199” pricing for a full house
  • Refuses to discuss pricing over the phone
  • Unable to give a rough estimate based on square footage
  • Discount after discount
  • Surprised pricing upon arrival
  • Can’t explain the process from start to finish


At Gray Duct Technologies, we know customers deserve to see the work that was done on their homes. We send before, during, and after photos from each home/job we complete.

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Photos will help document the journey your ventilation takes while they are being cleaned. Without photos to reference how do you know they have done the job correctly?

Red Flags

  • No before, during, or after photos included
  • Using “stock images” on social media
  • Using images/equipment from other companies• Using other companies website/social media accounts


At Gray Duct Technologies, we pay attention to the smallest details of cleanliness. Our goal is to leave every home cleaner than it was upon arrival. This includes inside and outside of your HVAC system. The first thing we do upon entry is to remove our shoes and/or wear booties over them. We also vacuum around any vents where dust may have settled after cleaning. Lastly, we vacuum the floor in the furnace room and any surrounding areas.

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A service technition should have the utmost respect for your property. Without that how can you expect them to take proper care of your ductwork?

Red Flags

  • Lack of shoe covers or shoe removal
  • Doesn’t clean registers/diffusers
  • Doesn’t vacuum or clean furnace surfaces and floor in the furnace room
  • Doesn’t seal/block off each vent off to prevent cross-contamination
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Grey Duct TechnologiesWhy Choose UsCertificationsServicesAvoid ScamsBefore/AfterArticlesAboutContact

Gray Duct Technologies

6100 McColl Dr, Unit 214

Savage, MN 55378