Image Title: 12x24 Cast Iron Renaissance Cold Air Return For Grilles Design 6. Filename: 12x24-cast-iron-renaissance-cold-air-return-for-grilles-design-6.jpg. Image Dimension: 600 x 500 pixels. Images Format: jpg/jpeg. Publisher/Author: Henry Jenkins. Uploaded Date: Monday - March 19th. 2018 23:36:11 PM. Category: Architecture. Image Source: architecture.com.