A Rectangular Batch Fryer (30 inch 54 inch 12 inches size) is a standard industrial workhorse for frying namkeen, potato chips, and snacks. This specific size—roughly $4.5 \times 2.5$ feet—is highly preferred in Ahmedabad because it balances high production capacity with fuel efficiency.

1. Technical Specifications

2. Diesel Consumption & Economics

In the current energy market, diesel-fired fryers are preferred over electric for large-scale production due to faster heating times and lower running costs.

• Diesel Consumption: Approximately 3.5 to 5.0 Liters per hour (varies based on product load).
• Heating Speed: Reaches frying temperature ($180^{\circ}\text{C}$) in roughly 15–20 minutes.
• Auto-Cutoff: Modern diesel burners are connected to a Digital Temperature Controller. Once the oil hits your set temperature, the burner stops automatically to save fuel and prevent oil burning.

3. Design Variants for this Size

• Direct Heat Model: The diesel burner is placed directly under the rectangular pan. This is cheaper to buy and compact in size.
• Inbuilt Heat Exchanger (Highly Recommended): The oil is heated inside tubes and circulated. This prevents "hot spots," reduces oil degradation, and can save up to 30% in fuel costs.
• Tilting Model: The pan is mounted on a pivot. Once the batch is done, you can tilt the entire pan to unload the product instantly into a collection tray.

4. Key Advantages

• Uniform Frying: The rectangular shape allows for better "raking" or "stiring" of products like Sev or Gathiya compared to a round kadai.
• Insulation: The outer body is insulated with Ceramic Wool, which ensures the heat stays in the oil and the factory environment remains cool for the workers.
• Chimney System: These machines come with a dedicated 6-inch exhaust pipe to vent out diesel fumes and smoke, keeping the food hygienic.