The outlet duct collar shows 8.5 inches. Is this correct? Ducts do not come in an 8.5 size.

Dear Customer, Thank you for your query. The outlet duct collar is listed as approximately 8.5 inches, which typically refers to the outer diameter of the collar. Standard duct sizes are usually measured by inner diameter (such as 8 inches), so an 8-inch duct is generally compatible and can be fitted securely over the outlet with proper clamping. We recommend using an 8-inch standard duct along with a clamp or reducer if needed to ensure a proper fit. Please let us know if you need any further assistance.

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Item#: 9SIA17PKTK7029

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Main image of Air Scrubber with 3-Stage Filtration, Stackable Negative Air Machine 550 CFM, Air Cleaner with MERV10, Carbon, H13 HEPA, for Home, Industrial and Commercial Use

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Air Scrubber with 3-Stage Filtration, Stackable Negative Air Machine 550 CFM, Air Cleaner with MERV10, Carbon, H13 HEPA, for Home, Industrial and Commercial Use

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3-stage Filtration: This air scrubber features a three-stage filtration system consisting of a pre-filter (MERV-10), carbon filter, and H13 HEPA filter. It effectively clears dust, pollen, smoke, and odors, while also capturing 99.97% of particles as small as 0.3 microns. This results in quick improvements to indoor air quality and a more pleasant living environment.
550 CFM Airflow: This negative air machine features a high-efficiency copper motor that is longer-lasting and more stable. With a 15.5'' intake and 8.5'' outlet, this air purifier provides optimal purification. It has a filtration area of 2150 cubic feet and a maximum airflow of 550 CFM (adjustable), ensuring that the entire room benefits from cleaner air.
User-friendly Control Panel: The control panel makes it easy to operate the air purifier's functions, including adjusting the airflow range, setting a resettable timer, and activating a circuit breaker for overheat protection

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Specifications

Item Model Number: ZHP2301-550
Airflow: 550 CFM
Filters: MERV10Carbon H13 HEPA
Power Cord: 23 ft / 7 m
Item Weight: 35 lbs / 16 kg
Air Inlet Size: 15.5 in / 39.4 cm
Air Outlet Size: 8.5 in / 21.6 cm
Item Dimensions: 24.2 x 15.9 x 23.5 in / 6.2 x 4.1 x 6 cm

Package Content
1 x Air Scrubber

Details
Type	Other Appliances

Additional Information
First Listed on Newegg	March 11, 2026

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Item#: 9SIA17PKTK7029