TITLE 24 AND HERS COMPLIANCE FOR BUILDERS

QuietCool is offered as a standard product in many new home communities by the nation’s largest home builders. QuietCool has proven home after home to be the single most effective energy-efficient product a builder can install to meet compliance and at the lowest cost available on the market today. Simply put, installing whole house fans are becoming required to stay competitive in the ever-changing new home marketplace.

As the industry leader in cooling ventilation, QC Manufacturing is proud to be continually improving the following services to assist our new construction developers:

Industry-leading products for cost and Title 24 efficiency
Title 24 consultations and value engineering services
Simple form factor and ease of installation
American made steel products with unmatched durability and performance
15-year product warranty on Pro Series
Contact us using the form below, to see the massive difference we can make on your next project’s budget!

Below is a set of specification tables for CA new construction, for industry professionals such as Builders, Title 24 modeling firms, Engineering firms, and city officials, which contain all the important specifications needed for new construction regarding the QuietCool Trident Pro, and Stealth Pro family of products.

New Construction Energy Modelling

Please choose the appropriate type of modelling you need from the tabs below

If you are a new home builder, or are an integral part of the new home industry and would like to schedule an informative presentation about the QuietCool Pro family of products, please complete the form below.

Download 2026 Default WHF Sizing - No ECC Specifications

Modelling Default WHF will autogenerate fan CFM airflow rates.

Select fan greater than or equal to Airflow CFM required on CF-1R from the list of products below.

Use the fans below for sizing and bidding only on T24 models with NO HERS (ECC Verification).

CF-1R Airflow CFM	QuietCool Fan Model(s)	Watts/CFM Efficacy	Venting Sq Ft.
1920	QC STL PRO-2.5X-RF	0.08	2.6
2350	QC STL PRO-3.3X-RF	0.11	3.2
3130	QC STL PRO-4.8X-RF	0.13	4.2
3750	QC STL PRO-5.5X-RF	0.13	5.0
4030	QC STL PRO 6.0X-RF	0.11	5.5
5200	QC STL PRO 7.0X-RF	0.14	7.0
5950	QC STL PRO 6.0X-RF + QC STL PRO-2.5X-RF	0.11	8.1
6380	QC STL PRO 6.0X-RF + QC STL PRO-3.3X-RF	0.11	8.7
7120	QC STL PRO 7.0X-RF + QC STL PRO-2.5X-RF	0.12	9.6
7550	QC STL PRO 7.0X-RF + QC STL PRO-3.3X-RF	0.13	10.2
8330	QC STL PRO 7.0X-RF + QC STL PRO-4.8X-RF	0.14	11.2
8950	QC STL PRO 7.0X-RF + QC STL PRO-5.5X-RF	0.14	12.0
9230	QC STL PRO 7.0X-RF + QC STL PRO-6.0X-RF	0.13	12.5
10400	QC STL PRO 7.0X-RF + QC STL PRO-7.0X-RF	0.14	14.0

Table 2025.1.F - Default WHF Direct Vent To Outside - No ECC Verification
CF-1R Airflow CFM	QuietCool Fan Model(s)	Watts/CFM Efficacy	Venting Sq Ft.
2950	RM-WHF-4.0-CRB-DG3	0.14	N/A - Direct Vent
5900	RM-WHF-4.0-CRB-DG3 (Quantity 2)	0.14	N/A - Direct Vent
8850	RM-WHF-4.0-CRB-DG3 (Quantity 3)	0.14	N/A - Direct Vent

Download 2026 Default WHF Sizing - No ECC Specifications

For questions regarding Title 24, Part 6 compliance modeling, and HERS verifications, please contact:

Rick Fayad | Email: [email protected] | Phone: 209-614-3935

Andy Llora | Email: [email protected] | Phone: 209-324-9482

Download 2026 Specified WHF + HERS Sizing Specifications

QuietCool specs for modelling Specified Whole House Fan cool vent measure.

Mandatory HERS is automatically added to CF-1R, shown as HERS Required = Yes.

Specifications below are NOT to be used for vertical / kneewall mount applications.

Table 2025.2 Specified Whole House Fan + HERS (2 CFM/sqft)
Home Size @ 2 CFM/sqft.	Product Info	HERS CFM	Watts	watt/CFM	*HERS Venting
567	STL Pro 2.5X	1134	198	0.175	2.60
851	STL Pro 3.3X	1701	315	0.185	3.20
1369	STL Pro 4.8X	2737	493	0.180	4.20
1603	STL Pro 5.5X	3206	545	0.170	5.00
1858	STL Pro 6.0X	3716	595	0.160	5.50
2481	STL Pro 7.0X	4962	794	0.160	7.00
2709	STL Pro 6.0X + 3.3X	5417	921	0.170	5.5 + 3.2
3048	STL Pro 7.0X + 2.5X	6096	1006	0.165	7.0 + 2.6
3332	STL Pro 7.0X + 3.3X	6663	1099	0.165	7.0 + 3.2
3850	STL Pro 7.0X + 4.8X	7699	1309	0.170	7.0 + 4.2
4084	STL Pro 7.0X + 5.5X	8168	1348	0.165	7.0 + 5.0
4439	STL Pro 7.0X + 6.0X	8878	1420	0.160	7.0 + 5.5
4962	STL Pro 7.0X + 7.0X	9924	1588	0.160	7.0 + 7.0

Table 2025.2.F Specifications Only for Flat Roof Applications
Note: These combinations are for sealed attics with no ventilation.
Home Size @ 1.5 cfm/sqft	Products	HERS CFM	Watts	watt/CFM	Venting
1469	RM-WHF-4.0-CRB-DG3	2805	435	0.1550	N/A
2939	RM-WHF-4.0-CRB-DG3 (Quantity 2)	5610	870	0.1550	N/A
4408	RM-WHF-4.0-CRB-DG3 (Quantity 3)	8415	1305	0.1550	N/A

Download 2026 Specified WHF + HERS Sizing Specifications

For questions regarding Title 24, Part 6 compliance modeling, and HERS verifications, please contact:

Rick Fayad | Email: [email protected] | Phone: 209-614-3935

Andy Llora | Email: [email protected] | Phone: 209-324-9482

Download 2026 WHF Sizing Specifications for Ekotrope

Individual fan modeling specifications shown below. Use any combination of 1 to 2 fans to meet the square footage.

Stealth Sizing (Maximum Compliance) - Modeling Input Values
Home SQFT	Product info	Fan CFM (High Speed)	Fan CFM (Over Night)	Fan Watts (High Speed)	Fan Watt (Overnight)	Fan Cover R-Value (Cooling Season)	Fan Cover R-Value (Heating Season)	Fan Opening Area (s.f.)
1000	Stealth Pro 2.5X*	2541	2018	157	82.3	5	45	1.725
2000	Stealth Pro 3.3X	3159	1980	264	74.6	5	45	2.14
2500	Stealth Pro 4.8X	4280	2361	408	73.9	5	45	2.92
3000	Stealth Pro 5.5X	5044	2870	490	88	5	45	2.92
3500	Stealth Pro 6.0X	5587	3428	462	113	5	45	3.5
4500	Stealth Pro 7.0X**	6996	4308	725	166	5	45	3.5

Trident Sizing (Lowest Cost) - Modeling Input Values
Home SQFT	Product info	Fan CFM (High Speed)	Fan CFM (Over Night)	Fan Watts (High Speed)	Fan Watt (Overnight)	Fan Cover R-Value (Cooling Season)	Fan Cover R-Value (Heating Season)	Fan Opening Area (s.f.)
1000	Trident Pro 2.5X*	2490	1934	244	198	5	45	1.75
2000	Trident Pro 3.3X	3216	2890	323	274	5	45	2.14
2500	Trident Pro 4.8X	4428	3436	555	417	5	45	2.92
3000	Trident Pro 5.5X	5068	4438	632	522	5	45	2.92
3500	Trident Pro 6.0X	5708	4319	777	560	5	45	3.5
4500	Trident Pro 7.0X**	7015	5548	1147	797	5	45	3.5

For questions regarding Ekotrope Whole House Fan software inputs and sizing:

Rick Fayad | Email: [email protected] | Phone: 209-614-3935

Andy Llora | Email: [email protected] | Phone: 209-324-9482

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