What is the minimum thickness for perforated sheet metal plates covering crawl space ventilation openings?

What is the minimum thickness for perforated sheet metal plates covering crawl space ventilation openings?

• A. 0.060 inches
• B. 0.070 inches
• C. 0.080 inches
• D. 0.090 inches

Answer: (B)

Crawl space vent covers use perforated sheet metal to let air through while preventing pests from entering. The plate must be thick enough to resist bending, denting, and small animal intrusion, and still be durable in the outdoor/moist environment where vents are located. The minimum thickness specified for these perforated plates is 0.070 inches, which provides the necessary rigidity without being unnecessarily thick or costly. A thinner plate could deform or fail to deter pests, while thicker options exceed the minimum requirement and aren’t needed for this purpose.

Crawl space vent covers use perforated sheet metal to let air through while preventing pests from entering. The plate must be thick enough to resist bending, denting, and small animal intrusion, and still be durable in the outdoor/moist environment where vents are located. The minimum thickness specified for these perforated plates is 0.070 inches, which provides the necessary rigidity without being unnecessarily thick or costly. A thinner plate could deform or fail to deter pests, while thicker options exceed the minimum requirement and aren’t needed for this purpose.