The flow rate would be dependent upon the configuration of the opening. A wider yet shorter opening would provide a greater flow rate than say a square opening of the same area. This may have something to do with the opening to floor area ratio they claim.
The lower in the wall, the better the flow rate also.
Engineered Flood Vents Have To Be Certifed By A PE
Anyone can use the simple open area formula. Only a PE can render more detailed calculations regarding the hydraulic values.
My gut feeling was off. Took a very close look at the calculations.
Paul in PA
Engineered Flood Vents Have To Be Certifed By A PE
> Anyone can use the simple open area formula. Only a PE can render more detailed calculations regarding the hydraulic values.
>
Agreed. That is why they call them 'Engineered'. I posted to show a link to FEMA TB01-08 and noted that it included the 'formula'.
DDSM;-)
I don't understand the big problem here. Check the box on the form that asks if they are "Engineered Vents". Note the model number and the calculated coverage on the form. Done and done.
Generally, "Smart Vents" are about 98% of what I see. I don't think for SmartVents, you even have to attach the generic engineering report anymore.
Now, these other kinds, I would still attach the report.
> I recommend you adhere to 44CFR60 (reference FEMA TB1-08) when completing an EC involving engineered openings.
> If you don't allow for the certified coverage and go with the net opening you are doing a disservice to your client.
ABSOLUTELY!!! your client is paying $200 Each for those smartvents. Not to mention if you just count the physical opening, they will most likely be Non-Conforming due to not meeting the minimum requirements. I would expect to get sued for a whole lot of money if my client spent $$ for years on their flood insurance because I was too afraid to fill out the form properly.
Yep...that's what I do.