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FAMCO SDB square to round HVAC transition Box, galvanized steel
FAMCO SDB square to round HVAC transition Box, galvanized steel
FAMCO Square to Round Transition Box Measurement Guide
Square to round duct transition box, front-facing angle.
Side angle of a square to round duct transition.
Back view of a square to round transition box.

Square to Round Transition Box

(72 customer reviews)

$24.95 – $79.95

  • Quality constructed from heavy-duty 28 gauge galvanized steel
  • Primarily for use to attach a ceiling register to your air supply
  • Can be used in many applications that transition a square duct to round duct
  • Available in a variety of common sizes, see the drop down menu for all sizes available

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SKU SDB Categories ,

Description

The FAMCO SDB square to round HVAC transition Box – diffuser is designed primarily for use to attach a ceiling register to your air supply, but can be used in many applications that transition a square duct to round duct. Quality constructed from heavy-duty 28 gauge galvanized steel. Available in a variety of common sizes, see the drop down menu for all sizes available. The FAMCO SDB square to round HVAC transition box is manufactured by FAMCO in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this product, please refer to the FAQs above or feel free to contact us.

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Spec Sheet

Print Spec Sheet

Square to Round Transition Box

SKU: SDB

Questions and answers of the customers

    Does the size pertain to the round duct size?
  1. Q Does the size pertain to the round duct size? answer now
    Asked on April 19, 2022 12:26 pm
    A

    Yes, the "size" selection refers to the round hole size. The "dimensions" selection would be for the square part of the box.
    A Yes
    A Yes
    2. I have a 18" Round Plenum, need to adapt to Rectangular plenum. is this made to order ?
  2. Q I have a 18" Round Plenum, need to adapt to Rectangular plenum. is this made to order ? answer now
    Asked on August 23, 2021 3:21 pm
    A

    These products are currently manufactured in our Meridian, Idaho factory - the sizes we are able to manufacture are those shown in the dropdown menu.
    3. Can these be used for a bathroom exhaust fan intake opening where moist air will travel through the vent?
  3. Q Can these be used for a bathroom exhaust fan intake opening where moist air will travel through t...... Read more answer now
    Asked on August 16, 2021 7:55 am
    A

    We would recommend asking your exhaust fan manufacture for their recommended install method.
    4. I'm looking for something like this but without the "box". I need need to connect round flexible duct to a rectangular hole on the main trunk, but with the "box" there's no mating surface (I need flat sides to secure with sheet metal screws). I suppose I could break the welds and hammer the sides flat but do you have a product like I'm describing? I can find them in plastic but would prefer galvanized aluminum. Thanks.
  4. Q I'm looking for something like this but without the "box". I need need to connect round flexible ...... Read more answer now
    Asked on August 12, 2021 7:52 am
    A

    This is not something that we currently supply or manufacture.
    A The magic phrase is Start Collar. You need a start collar, either buy it (somewhere), or watch a YouTube video.
    5. I need a 13"×14"×6"round
  5. Q I need a 13"×14"×6"round answer now
    Asked on July 29, 2021 7:24 pm
    A

    This is not a size we are currently able to manufacture, unfortunately.
    6. I need a 24" x 24" and 14" diameter transition box. Do you have this size? Thanks
  6. Q I need a 24" x 24" and 14" diameter transition box. Do you have this size? Thanks answer now
    Asked on June 16, 2021 11:48 am
    A

    Yes - this is a size we are currently able to manufacture, you can select these dimensions in the dropdown.
    7. If I order today ..which one is the delivery date? thanks
  7. Q If I order today ..which one is the delivery date? thanks answer now
    Asked on June 12, 2021 12:58 pm
    A

    Current manufacturing and shipping estimates are given in the shopping cart and at checkout.
    8. I need a 10"w x 3-1/4 to a "6 inch-round
  8. Q I need a 10"w x 3-1/4 to a "6 inch-round answer now
    Asked on May 18, 2021 5:49 pm
    A

    This is not a size we currently manufacture, unfortunately.
    9. Do you make w 16”. L18” round 14. Duct adapter
  9. Q Do you make w 16”. L18” round 14. Duct adapter answer now
    Asked on May 2, 2021 12:06 pm
    A

    We currently only manufacture the sizes shown in the dropdown menu
    10. Do you make these in 18Wx18Lx12D
  10. Q Do you make these in 18Wx18Lx12D answer now
    Asked on April 25, 2021 1:05 pm
    A

    Yes - all sizes available can be selected in the dropdown on the product page.
    11. Could we order this for a custom size box of 16 x 25 in square and 8-inch diameter circle? Thank you.
  11. Q Could we order this for a custom size box of 16 x 25 in square and 8-inch diameter circle? Thank ...... Read more answer now
    Asked on October 25, 2020 11:17 pm
    A

    We currently only offer customization on volume runs with a total value greater than $5,000

72 reviews for Square to Round Transition Box

5.0
Based on 72 reviews
5 star
98
98%
4 star
1
1%
3 star
0%
2 star
0%
1 star
0%
Showing 1 of 72 reviews (4 star). See all 72 reviews

  1. Mark Nuhfer (verified owner) –

    Exactly what I ordered
    Just a little expensive with the shipping being about the same price as the product.
    But I knew I needed it.
    The quality is there long after the price is gone.

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OUR PRODUCT GUARANTEE

FAMCO prides itself on Quality Built Products manufactured from quality raw materials. All products are guaranteed to be free of defective material or workmanship for a period of one year from the date of delivery. During the guarantee period, if any parts prove defective, they will be replaced free of charge. Please click here to review a complete version of our limited warranty.
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