Imperial USA’s commercial door resources give contractors, distributors, and specifiers the practical tools they need to get every door and frame job right. Whether you are specifying a single opening or managing a large commercial project, our guides help you confirm the details before you request a quote.

Our reference charts cover the essentials, including door handing, hollow metal door finishes, and a step-by-step measuring worksheet. Furthermore, each guide is built around real specifications — the same data our team uses to quote and fabricate doors, frames, and hardware. As a result, you can gather accurate information the first time and avoid costly reordering.

Beyond the charts, our blog covers door hardware selection, ANSI and ADA compliance, fire ratings, and installation best practices. In addition, every resource links directly to the related product categories, so you can move from research to specification in a few clicks. These commercial door resources are updated regularly as we add new tools and articles.

Imperial USA has supplied commercial door hardware and hollow metal products since 1994. Therefore, these resources reflect decades of experience helping customers across the United States. Browse the charts, guides, and articles below, and reach out to our team whenever you need help with a specification or a custom quote.