HVACQuick CFB-HP Series HEPA Inline Filter Boxes

The CFB-HP-6 HEPA filter box from HVACQuick is a high-performance solution for HEPA in-line filtration. Constructed from 5052 H32 aluminum, the CFB-HP-6 holds an H13 HEPA filter as well as a 2" MERV-11 pre-filter and is designed to fit 6" diameter duct. Features an access panel for proper sealing, and opens easily for quick filter replacements. First set of HEPA and pre-filters are included. These are un-powered boxes so no fan is included. Note some assembly is required.

The CFB-HP-6-LL HEPA filter box has a deeper HEPA filter for a lower pressure drop and lasts longer before requiring replacement of the HEPA filter.

The HEPA filters used in our CFB boxes is an H13 (EU standard) certified as 99.95% efficient. Each HEPA filter comes complete with a individual test certificate and front face gasketing.

Large orders are welcome, and may benefit from additional quantity discounts. Call us for more information or for resale opportunities.

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model	description	usually ships	1-2 units	3+ units
CFB-HP-6	HVACQuick CFB-HP HEPA series inline filter box. For 6 inch ducts. Includes lid, HEPA filter and MERV-11 pre-filter.	1 Day. In-stock	$299.00	$279.00
CFB-HP-6-LL	HVACQuick CFB-HP-LL HEPA series inline filter box. For 6 inch ducts. Low pressure drop filter. Includes lid, Long lasting deep (6in) HEPA filter and MERV-11 pre-filter.	1 Day. In-stock	$339.00	$319.00
PF11-16X16X2A	16x16x2A (Actual Size) MERV 11 filter. Replacement pre-filter for CFB-HP-6 and CFB-HP-6-LL. 1 filter.	1 Day. In-stock	$18.99	$17.99
CFB-HP-HEPAFILTER	Replacement HEPA filter for CFB-HP-6 filter boxes. 16x16x2. Part HP-H13-G45-406x406. 1 filter.	1 Day. In-stock	$119.00	$112.00
CFB-HP-LL-HEPAFILTER	Replacement HEPA filter for CFB-HP-6-LL filter boxes. 16x16x6. Part HC-H13-A-7-406-406-150-FB-PP. 1 filter.	1 Day. In-stock	$159.00	$152.00

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#1	Q: Can this filter box be mounted such that the face gasket of the HEPA filter is pointing up, or could this cause some air to bypass the filter? A: Yes. The filters are reasonably tight in the enclosure. If you need extra pressure on the gasket you can always insert a thin wedge between the pre-filter and the enclosure. Asked on 2026-09-18 by B
#2	Q: Would the LL version of this filter work well if paired with the Broan B210E75R AI Series 210 CFM, or would there be too much pressure drop? If there is too much pressure drop, is there a HEPA filter you would recommend? A: Too much pressure drop depends on the rest of your system. The Broan unit is capable of around 200 CFM at 0.6 inches of static and the pressure drop at 200 CFM is around 0.5 inches for the CFB-HP-6-LL so that lines up relatively well -- providing the rest of your ducting/etc is low resistance. Definitely go with the lower pressure CFB-HP-6-LL filter box instead of the standard one. Asked on 2026-08-17 by Brett
#3	Q: What is the frame material of the pre-filter and the HEPA filter? A: The HEPA filter has a metal frame with front face gasket, and the MERV filter is just a normal cardboard frame. Asked on 2026-02-18 by Pearl
#4	Q: Do you have any higher rated HEPA filters or ULPA filters for this unit? If not, do you carry another filter unit else that does? A: These are the only HEPA filters that fit this unit. If you need a higher flow HEPA then look at the IFHB filter boxes: https://www.hvacquick.com/products/residential/COVID-19-Mitigation/Powered-HEPA-Filters/HVACQuick-IFHB-Series-Inline-HEPA-Filter-Boxes Asked on 2025-03-04 by Tom
#5	Q: Actual size of merv 11 pre filter for the cfb-hp LL? Recently bought this unit but see your backordered on these. I need some hoping you have Actual dimensions so it fits snug? Thank you. A: They are exactly 16x16 inch. No undercut. Asked on 2025-01-31 by Cb
#6	Q: I want to install a HEPA filter on the fresh air intake duct for a Trane furnace. With the CFB-HP-6, would I need to add an inline fan, or would the furnace fan be sufficient to draw around 20 CFM? A: Its hard to predict how much airflow you would get through the HEPA. Air will be drawn from the least restrictive source(s). Fans are typically recommended as they you will be assured you will get airflow through the HEPA. Asked on 2024-12-21 by Larry
#7	Q: Do you sell the CFB-HP-6 (16x16 to 6 filter box) without the filters? What price? A: We will sell those empty with no hepa filter, best to call customer service at 888-855-7229 to get price and place the order. Asked on 2023-04-18 by Paul
#8	Q: Hi if I were to add this to the intake on my Lifebreath RNC155 HRV at 132Cfm would I need to add an additional fan or will the HRV alone be sufficient? A: It would most likely not be sufficient. We do not have fan curves for the RNC unit but most HRVs cannot handle the pressure drop of a HEPA filter. At 130 cfm the hepa has a 0.46 inch pressure drop. Asked on 2022-10-31 by Jake
#9	Q: With the Hepa version of this filter, what would be the appropriate cfm fan to use, to get maximum output of air blowing out? With that fan what would be the maximum cfm of air output? A: We typically recommend 200 CFM or less for this hepa unit (Fantech FG 6 fan). You could certainly try to get more with a higher pressure fan such as the Fantech FG 6XL but we have not tested that combo. Asked on 2022-09-27 by James
#10	Q: What is pressure drop across these 2 filters at 200 cfm? A: We have not tested this filter at 200 cfm. The highest test sample we have is 0.464 inches of pressure drop across the filter box at 130 CFM. Asked on 2021-07-05 by Allan
#11	Q: What is the rated airflow capacity of this HEPA filter? A: Ideal flow is about 200 cfm or less. No official maximum but you would get very high pressure drops beyond that. Asked on 2021-05-14 by SJ Y
#12	Q: What would be a good way to add carbon filtration to this? Would you recommend a second filter box with the 4 inch carbon impregnated filter, or can I switch the 2 inch MERV 11 prefilter in this box to a 2 inch carbon impregnated filter? Or would one of the carbon canister filters be better? A: If you want some carbon filtration then replace the 2 inch MERV 11 with an equivalent size carbon filter. It would have to be exactly 16x16 and not undercut. You can special order that from us. If you want a lot of carbon filtration then get a carbon canister filter which has a lot more carbon and a higher contact time for better filtration. Asked on 2021-03-07 by AA
#13	Q: will this accept 16x16 standard brand name HEPA filters? I do not want to be tied to trying to remember where to get filters every time. thanks A: The answer is maybe. There are no standards for sizing and different manufacturers have different undercuts from the list size. You would have to get exact (not list size) measurements from the other filters and compare to the ones that come with the CFB. Asked on 2020-09-12 by craig
#14	Q: Is there a max permissible CFM across filter assembly? Blower of choice flows 1500 cfm unrestricted - I know large flow will induce Flow/ pressure drop, totally fine, just want to make sure I wont damage filter. A: At 1500 cfm you are well beyond the capability of the filters. These are typically used on systems in the 100-200 cfm range. Asked on 2020-09-07 by MB
#15	Q: Am interested in using this unit with a merv13 in place of the final HEPA-rated filter; would a spacer be necessary to make up for the undercut and if so what do you recommend? A: Yes, you would need a spacer. Its hard to say what size you would need as every filter manufacturer has a slightly different undercut. We have MERV-13 versions of these here: https://www.hvacquick.com/products/residential/Air-Filters/Powered-HEPA-Filters/HVACQuick-CFB-Series-MERV-13-Inline-Filter-Boxes Asked on 2020-07-25 by Matt
#16	Q: We use 7ID duct and this item is little small for duct we use. Can you receive special order to change dimension from 6 to 6-1/2? A: We can definitely make a special order size but would need an item qty commitment/purchase to justify the engineering costs. Please give us a call or email team@hvacquick.com with your requirements and we can quote it for you. Thanks. Asked on 2020-07-13 by Norio
#17	Q: Is this available for 8 ducts? A: Not currently. If you are looking for a large qty of these please call us and we can special make them. We do have the CFB-8 which has an optional MERV-15 filter (hear HEPA filtration): https://www.hvacquick.com/products/residential/Air-Filters/Inline-Filter-Boxes/HVACQuick-CFB-Series-MERV-13-Inline-Filter-Boxes Asked on 2020-04-13 by Jd419
#18	Q: Are the filters washable or must they be replaced periodically? Is there a recommended replacement schedule? A: Not washable. Schedule depends on the use and loading type. For typical household use, its 3 months for the pre-filter and 2-5 years for the HEPA. Asked on 2019-11-09 by NM
#19	Q: Hello - is there any mounting brackets? If not, please advise on how these are supposed to be mounted to wall/ceiling. Thank you! A: There are no wall/ceiling mounting brackets for this unit. Its typically hung from the duct and supported by field supplied straps or sitting on the ground. Asked on 2019-09-02 by R
#20	Q: What are the overall dimensions of this unit. A: It is 20 inches long, including the cones and the box portion is 16.5x17.5x4 inches. See the Specs tab for more info. Asked on 2019-02-09 by D
#21	Q: Im interested to know if i could insert a higher merv rated filter, add a fan and use for biological protections. A: We could special order MERV-13 filters to replace the MERV-11. However, the MERV-11 prefilter is only there to limit the loading of the HEPA filter which gives you the primary filtration. Call or email us if interested. Asked on 2018-11-05 by mike
#22	Q: Is it recommended to have the inline fan pushing air through the filter box or pulling it through? Thank you! A: We typically see fans pulling air through the filter box so that filtered air enters the fan. Asked on 2018-10-18 by R
#23	Q: What is the merv rating on the hepa filter itself? Not the prefilter which says its a merv 11.Thank you. A: HEPA air filters are not MERV rated as they exceed the ASHRAE test protocol 52.2 used in determining the MERV ratings. All HEPA air filters must meet a minimum efficiency of 99.95% at 0.3 microns. Asked on 2018-10-12 by Ross

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