Trimvane: Air Balance Reports

Trimvane is the offline report app for HVAC test, adjust and balance technicians. Enter design and measured airflow outlet by outlet, traverse the ducts, read the fans, VAV boxes, pumps and balancing valves, and produce a signed TAB report with a table of contents, deficiency summary and instrument list before you leave the site.

OUTLETS, FAST
• One outlet at a time with big numbers: design, initial and final, % of design as you type
• Save and next walks the system in order; the balance band shows every outlet against the tolerance at a glance
• Capture hood with correction factor, Ak × velocity, K-factor or branch readings
• Paste the outlet schedule from a spreadsheet instead of typing it

DUCT TRAVERSES
• Log-Tchebycheff, log-linear and equal-area layouts, with hole positions and insertion depths in inches
• Velocity pressure at each point, averaged as velocities, never as pressures
• Air density from the site barometer, duct static pressure and temperature, or standard air
• Actual and standard CFM, and the 75%/10% plane quality test

FANS, UNITS AND VAV BOXES
• Supply, return and outside air; outside-air fraction from temperatures or CO₂
• External and fan static pressure, sheaves, belts, belt slip, VFD speed
• Volts and amps per leg, % of full-load amps, voltage and current imbalance, brake horsepower two ways
• Fan-law what-if: the speed, sheave and horsepower that bring a fan to design
• VAV maximum, heating and minimum: design, controller reading and measured, with the correction factor

PUMPS, VALVES AND COILS
• Pump head from your gauges and flow read off the maker's curve
• Circuit setters and balancing valves from Cv or Kv and the pressure drop (psi or ft), or a meter readout
• Coil capacity at test conditions: total, sensible and latent from dry and wet bulbs at the site pressure, and the water side

TOLERANCES YOUR SPEC SETS
• Start from a common profile and set every band to the project spec: fans, outlets, boxes, outside air, coils, pumps
• Small-flow rules such as ±10 CFM for small outlets
• Out-of-tolerance figures flagged everywhere and listed in the report summary

A REPORT THE ENGINEER ACCEPTS
• Cover, certification page with your stamp beside your signature, table of contents with page numbers
• Summary with the set-up narrative, deficiencies with the page they appear on, and every figure outside tolerance
• Instrument list with serial numbers and calibration dates, checked against your test dates
• Data sheets for every unit, outlet list, VAV box, traverse, coil, pump and valve, with remarks
• Title and wording to suit your certifying body; you add your own stamp and statement
• Export all readings as CSV for the engineer or commissioning agent

BUILT FOR THE FIELD
• Works fully offline on roofs and in mechanical rooms. No account, no sign-in
• Your projects stay on your device. No cloud, no tracking, no ads
• Export all data to one file to keep a copy or move to a new phone

TRY IT FREE, THEN PICK A PLAN
Try Trimvane free on one project (reports marked Trial). Trimvane Pro gives you unlimited projects and clean, branded reports. Start with a 7-day free trial of the monthly or yearly subscription, or pay once for lifetime access. Subscriptions renew automatically until you cancel them in your store account settings.

Trimvane is an independent tool for TAB technicians and firms. It does not measure anything itself: it records the readings you enter from your own instruments. It is not affiliated with NEBB, AABC, TABB, ASHRAE or any instrument maker.