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NOTE: As of 4/13/26, Omega National's prefix has changed from NP to RS. This part number has changed from NP90330BP25 to RS90330BP25.
7" Round Backdraft Damper identifies this part as a 7 inch round damper that controls airflow in a duct run. This size-focused design lets you match it to 7 inch duct layouts commonly used with wood range hoods in kitchen projects.
The product name "7" Round Backdraft Damper for 250CFM Blower" defines it as a damper intended to work with a 250 CFM blower. That capacity focus supports range hood installations built around that airflow performance level.
The SAP description "DAMPER, 7' ROUND" confirms the basic form as a round damper in the 7 inch class. This consistent description helps you plan duct routing and transitions around a single round size through the entire hood system.
The product class "Range Hood Accessories and Ductwork Kits" places this damper within range hood ductwork components. That classification underscores its role as part of the ventilation path rather than a decorative hood element.
The web description noting it is "Designed for Broan Ventilator (Sold Separately): NPRHVBF10SM" identifies a design link to a specific Broan ventilator. That design intent supports use in systems built around that named ventilator model.
The SAP description "DAMPER, 7' ROUND" describes a 7 inch round form that works with 7 inch duct runs. This matching geometry keeps layout straightforward when you are routing a straight round line from a wood range hood.
The product class "Range Hood Accessories and Ductwork Kits" confirms that this damper belongs in the range hood vent path. That focus keeps it aligned with the shorter, direct duct runs common between hoods and exterior terminations.
The name "7" Round Backdraft Damper for 250CFM Blower" links the 7 inch diameter and 250 CFM designation, helping you coordinate hood blower selection and damper sizing during planning rather than revisiting the duct design later.
The alignment with a 7 inch round layout and 250 CFM blower geometry supports predictable airflow within that design envelope, which helps maintain the intended performance of the wood range hood setup.
The category path "Kitchen & Bath Cabinet Accessories|Wood Range Hoods" ties this 7 inch round damper directly to wood range hood installations. That linkage keeps the part focused on cabinet-integrated hood designs rather than general duct layouts.
The product class "Range Hood Accessories and Ductwork Kits" further positions this damper inside the kitchen venting assembly. This role places it alongside blowers, ducts, and terminations in a range hood system rather than elsewhere in a building.
The web description stating it is a "7" Round Backdraft Damper Designed for Broan Ventilator (Sold Separately): NPRHVBF10SM" shows it is intended to operate with that Broan ventilator model. That design intent helps you coordinate the damper position relative to that blower in the duct run.
The product name referencing a "250CFM Blower" connects the airflow rating to the damper choice. This clear pairing supports projects where a 250 CFM blower is part of the plan, so the damper expectation lines up with the chosen ventilator output.
The manufacturer part number "90330BP25" identifies this exact damper within Omega National Products offerings. That precise ID supports consistent specification across multiple similar wood range hood jobs.
The consistent "7" Round" descriptors in the name and SAP description reinforce a single 7 inch round size across references. That consistency helps reduce dimension confusion when coordinating cutouts, duct fittings, and transitions in the hood duct line.
The classification as "Range Hood Accessories and Ductwork Kits" keeps its application centered on range hood venting. This focus means its role is aligned with moving air from a cooking area through planned duct routes.
The brand "Omega National Products" connects the damper to a manufacturer known in the wood range hood space by context of the category. This connection supports using it alongside their wood range hood components when a coordinated system is required.
The web description noting it is designed for a Broan ventilator model NPRHVBF10SM ties the damper to a specific ventilator design. That tie supports consistent airflow behavior when that ventilator is part of the duct system.
The presence of both a manufacturer part number "90330BP25" and the matching code in the product URL helps maintain clarity between documentation and ordering. That clarity supports straightforward replacement or duplication on future projects using the same configuration.
The 7" Round Backdraft Damper is classified under Range Hood Accessories and Ductwork Kits, so it is used in range hood ventilation systems, especially those tied to wood range hoods.
The SAP description "DAMPER, 7' ROUND" defines a 7 inch round form, so duct planning centers on matching 7 inch round duct sections at the damper location for consistent airflow.
The product name states "7" Round Backdraft Damper for 250CFM Blower," indicating it is intended for use with a 250 CFM blower in the range hood setup.
The web description notes it is designed for Broan ventilator NPRHVBF10SM, so its performance intent is aligned with that specific ventilator model in a duct system.
The category "Kitchen & Bath Cabinet Accessories|Wood Range Hoods" links the damper directly to wood range hood projects where cabinet-style hoods vent through ductwork.
Part number 90330BP25 uniquely identifies this 7 inch round backdraft damper from Omega National Products, supporting accurate specification and reordering for projects.
The product name "7" Round Backdraft Damper for 250CFM Blower" and SAP description "DAMPER, 7' ROUND" define a 7 inch round damper tailored to a 250 CFM blower. Those matched details support range hood projects built around a 7 inch duct run and that airflow.
The classification under "Range Hood Accessories and Ductwork Kits" and category link to "Wood Range Hoods" position this Omega National Products part for kitchen hood work. When that combination fits your planned blower and duct size, this damper aligns with that design path.
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