Curb Extensions GPE GPEX ATE VCE ISB × VCE A curb extension featuring vents along each side. Typically used in a kitchen application with a non-vented curb to provide an installation in accordance with NFPA 96. Height varies by size Purchase Options: REQUEST A QUOTE Configure to Order Need a specific configuration? Submit a request online and get a quote from your local representative within 4 hours. REQUEST QUOTE