Ductwork for Heating, A/C and Ventilation (2026-04-23)

Building on a history of duct construction standards nearly 100 years old, the flagship SMACNA HVAC Duct Construction Standard – Metal & Flexible 4th edition represents the state of the art in the sheet metal duct fabrication and installation requirements. Significant changes for the 4th edition include; flat oval tables for positive/negative pressure applications; spray and aerosolized duct sealants; non-fiberglass duct liner applications; added information on spiral duct fittings; updates to duct hanger requirements; flexible duct hanger spacing and support bracing.

Sheet Metal blends basic principles with contemporary tools and technology. Now including workbook questions, this edition is concisely written, with large, two-color illustrations and updated photography to emphasize key points.

This durable two-sided plastic sizing wheel comes with a complete instruction manual for residential and commercial duct-sizing procedures. Designed by Hank Rutkowski.

NFPA 96 establishes the essential guidelines for designing, installing, operating, and maintaining ventilation and fire protection systems in commercial kitchens. It covers key components such as hoods, ducts, fans, grease filters, and fire suppression systems, ensuring these elements work together to minimize fire risks.

The standard emphasizes regular inspection, cleaning, and maintenance to prevent the buildup of flammable grease within exhaust systems—one of the leading causes of kitchen fires. Compliance with NFPA 96 helps ensure both safety and operational efficiency in commercial cooking environments.

Flip through the 2021 IMC and find frequently used sections fast! You'll be surprised how easy it is to find what you are looking for. These tabs were created by industry experts who carefully identified the most referenced sections in the code.

Loose Leaf Tabs Contain: Full-page inserts tabs that have the key code sections printed on them in an easy-to-read format.

Soft Cover Tabs Contain: Clear plastic, self-adhesive tabs that have the key sections of the code printed on them in an easy-to-read format.

Establishes minimum regulations for mechanical systems using prescriptive and performance-related provisions. The IMC was developed with broad-based principles that make possible the use of new materials, methods and design.

Important changes in the edition include:

Clothes dryer exhaust terminals required to be at least 3 feet from any opening into a building.
Polyurethane spray-applied foam on the exterior of ducts in attics and crawl spaces required to meet specific smoke and flame index limits.
Fire and smoke dampers must be provided with approved access for inspection and maintenance.
Refrigerant tables updated to include new refrigerants.
Addition of condensate termination identification markings and discharge restrictions.
Approved factory-built combination intake/exhaust terminations permitted, relaxing separation requirement.
30% reduction in minimum mechanical ventilation for whole-house balanced ventilation systems.
Continuous operation requirement for manicure and pedicure station exhaust systems.
Grease duct horizontal cleanout required within 3 feet of a horizontal discharge fan.

Our OSHA 29 CFR 1926 Construction Regulations book gives you quick, easy access to essential safety guidance whenever you need it. It helps employers and workers identify hazards fast and stay compliant on any jobsite. The 2026 edition features a clear two-color layout, includes all 1926 regulations along with key 1903, 1904, and select 1910 rules, and highlights any regulation changes between editions. Icons make it simple to find OSHA interpretations, and the book also includes OSHA Form 300, the Cancer Policy, and In-Cite references to 1910 standards. Frequently cited standards are placed before their related subparts for even easier navigation.