How accurate are the material takeoff and cost calculations?

Calculations are grounded in industry-standard engineering formulas (such as compacted density multipliers, ASTM standards, and CSI MasterFormat divisions), with customizable local material unit costs and compaction waste factors.

What waste allowance factor should be added to material orders?

For commercial and residential trade installations, standard engineering practice recommends including a 5% to 10% material waste and compaction contingency factor.

Can I export these takeoff sheets for client bidding?

Yes, you can export full itemized material schedules and bid breakdowns directly to CSV or printable takeoff summaries.

Commercial DOAS & Kitchen Hood Demand Ventilation Sizer

💨 1. Ventilation Airflow & Hood Parameters

Design Outdoor Airflow (CFM)

Kitchen Hood Type / Space

Kitchen / Ventilation Operating Hrs (hrs/day)

Operating Days Per Year

🔄 2. Energy Recovery & DCKV Turndown

Demand-Controlled Ventilation (DCKV)

Energy Recovery System

Make-Up Air Heating Plant

Design Climate Zone

💰 3. Tariffs, CapEx & Incentives

Natural Gas Rate ($/Therm)

Electric Rate ($/kWh)

Turnkey CapEx per CFM ($/CFM installed)

Utility Rebates per CFM ($/CFM)

20-Year Net Value Created (NPV @ 7%)

$248,600

Internal Rate of Return (IRR): 38.4% • Simple Payback: 2.6 Yrs

Annual Operating Savings

$31,240/yr

Gas Displacement + Fan Energy

Gas Therms Displaced

16,450 Th/yr

Direct combustion eliminated

Turnkey Gross CapEx

$97,750

$11.50 / CFM airflow

Total Utility Incentives

$21,250

DCKV + Heat Pump DOAS Rebates

📊 Ventilation Takeoff & Carbon Abatement

Component / Metric	Design Value	Engineering & Financial Impact