Key Inputs

Unit Conditioned Volume

Baseline Unit Compartmentalization (ACH50)

Baseline Unit Compartmentalization (CFM50)

Target Unit Compartmentalization (ACH50)

Baseline Whole-Building Infiltration (ACH50)

Target Whole-Building Infiltration (ACH50)

Unit Compartmentalization : Whole-Building Infiltration Ratio

Air Density

Discharge Coefficient

CFM50 per sq inch of Effective Leakage area

Air Sealing Logic Engine

Strategy & Logic	Strategy-specific Inputs	ΔCFM50 - leakage reduced	% leakage reduced	Projected Unit Compartmentalization (ACH50)	Projected Whole-Building Infiltration (ACH50)
AS-01 i Seal box beams to sleepers Sill plates are the longest continuous junction in the shell. By sealing this line, you are neutralizing hundreds of feet of potential leakage in one shot. Source: PNNL: Sealing Sill Plates	Sealed length of sill plate in ft i ft Crack width in inches i in	108.00	14.71%	3.04	1.52
AS-02 i Foam mating wall gaps Voids between modules act as unconditioned zones so sealing them will eliminate the highest shared air situation. Source: BSC: Sealing the Right Walls	Fraction of that leakage attributable to the void being sealed i fraction	363.52	49.50%	1.80	0.90
AS-03 i Seal mechanical chases Height drives the straw effect as noted in the report. Source: BSC: Sealing Penetrations	chase cross-section area of the unsealed gap/crack i sq ft floor height driving the stack i ft temperature difference between inside and outside i F CFM50 per CFM natural empirical ratio i ratio T_avg i R gravitational acceleration in ft per sq sec i ft/s²	285.37	38.86%	2.18	1.09
AS-04 i Stairwell drywall strip & sealant Bridges the RC gap around unit boundaries. Source: DOE: Multifamily Separation Walls	Sealed perimeter in ft i ft gap width in inches i in	337.50	45.96%	1.93	0.96
AS-05 i Seal accessible MEP penetrations Air seal around all plumbing and piping installed through walls, ceilings, and flooring. Source: ES MFNC Field Checklist	sealed length around the MEP penetration in ft i ft gap width in inches i in	270.00	36.77%	2.25	1.13
AS-06 i Tape all subfloor seams We need to choose the primary pressure plane preventing air entry into floor cavities. Source: DOE: Air Seal Subfloor Penetrations	sealed length around the MEP penetration in ft i ft gap width that is getting sealed i in	2235.60	304.42%	0.00	0.00
AS-07 Seal Zip sheathing at bottom Required to connect Zip to foundation sleepers. Source: PHIUS basics	Coming Soon	---	---	---	---
AS-08 Sealant beads at sleepers Replaces structural gaps with high performance gasket seal during box set. Source: PNNL: Modular Marriage Joints	Coming Soon	---	---	---	---
AS-09 i Sealant at rim joist perimeter Rim joists typically account for 15-25% of total envelope infiltration. Source: BSC: Air Barrier Research	Projected/Intervention sealed length i ft fraction of total envelope leakage attributable to rim joist i fraction	110.16	15.00%	3.03	1.52
AS-10 i Seal register boots High pressure duct to wall cavity bypass leakage prevention. Source: PNNL: Sealing Drywall to Plate	Number of register boots i count gap area per boot in sq inches i sq in	162.00	22.06%	2.78	1.39
AS-11 Air seal bottom plates This should address baseboard-to-floor bypasses found during Gilman testing. Source: PNNL: Air Sealing Plumbing	Coming Soon	---	---	---	---
AS-12 i Seal rim joist before Zip Pre-sheathing ensures continuity in field or factory. Source: Siplast: Air Barrier Transitions	fraction of total envelope leakage attributable to rim joist i fraction	110.16	15.00%	3.03	1.52
AS-13 Seal beam before Zip Sealant bead isolates structural frame from exterior sheathing as per ASHRAE 90.1. Source: PNNL: Modular Marriage Joints	Coming Soon	---	---	---	---