GasVent is Windows software for sizing vents and connectors for Category I gas-fired appliances such as furnaces, water heaters, and boilers. It follows the International Fuel Gas Code and National Fuel Gas Code to calculate correct diameters and configurations for single or multiple appliances in single- or multi-story buildings. The program sizes Type B and single-wall metal vent connectors, double-wall metal vents and liners, interior/exterior masonry chimneys, accommodates draft-hood and fan-equipped appliances (including single- and multi-stage units), accounts for elbows, lateral lengths, corrugated connectors, and vent dampers, and computes combustion air requirements. Context-sensitive graphical help supports efficient use.

Key Features

Code-compliant vent and connector sizing Applies recognized fuel gas codes.

• Calculates vent and connector sizes per International and National Fuel Gas Codes.
• Supports Category I appliances including furnaces, water heaters, and boilers.

Comprehensive configuration coverage Handles real-world layouts and equipment.

• Sizes Type B and single-wall connectors; double-wall metal vents and liners.
• Calculates interior/exterior masonry chimney sizes for single or multiple appliances.

Advanced layout accommodations Reflects installation constraints.

• Works for single- and multi-story buildings; adjusts for extra elbows and lateral lengths.
• Accommodates 45°/90° elbows, corrugated connectors, and vent dampers.

Appliance and staging support Matches equipment characteristics.

• Allows draft-hood and fan-equipped appliances.
• Accommodates single- and multi-stage appliances.

Combustion air calculations Ensures adequate air supply.

• Computes combustion air requirements as part of the design.

Usability aids Speeds accurate setup.

• Easy to use with graphical context-sensitive help.

Benefits

Safer, code-aligned vent designs Reduces performance and safety risks.

• Correct sizing lowers risks of condensate damage and carbon monoxide hazards.
• Coverage of multiple configurations supports compliant installations across projects.

Faster design and documentation Improves productivity.

• Integrated calculations for vents, chimneys, and combustion air streamline workflows.
• Graphical help reduces learning curve and errors.