Built from real ductwork installation
Practical ventilation tools for work on site.
Fast calculators for duct fitters, installers and supervisors. Choose a tool, enter the measurements and get the result without digging through an article first.
VentTools calculators
Choose a site tool
The calculator opens first. Practical guidance and worked examples sit underneath.
Ductwork Offset Calculator
Straight cut length, travel, roll angle and minimum rise using practical bend take-offs.
Open calculator →
Round / Rectangular Duct Converter
Try practical widths and heights quickly while keeping equal or greater free area.
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Fire Damper Opening Calculator
Manufacturer-specific openings and setting-out chains with official source links.
Open calculator →Project records
Keep checked damper results together
Save results by tag and location, then reopen them or produce a Site Instruction Sheet.
Site knowledge, not generic filler
VentTools is independent and built around real installation problems. The photographs are original site work, calculation assumptions are shown, and manufacturer-specific fire-damper methods link back to official documents.