1. Introduction
Thank you for choosing the COBIZI 12x20 Heavy Duty Outdoor Gazebo. This manual contains important information regarding the safe assembly, operation, and maintenance of your gazebo. Please read it thoroughly before beginning assembly and retain it for future reference.
Safety Precautions
- Ensure all components are present and undamaged before assembly. Do not proceed with assembly if any parts are missing or broken.
- Assembly requires at least 2 people.
- Choose a level and stable surface for installation.
- Securely anchor the gazebo to the ground using the provided expansion bolts and stakes, especially in windy conditions.
- Do not use open flames or heating appliances inside the gazebo.
- In case of strong winds, heavy rain, or snow, remove the canopy fabric to prevent damage to the structure.
2. Product Overview
The COBIZI 12x20 Heavy Duty Outdoor Gazebo is designed to provide a spacious and comfortable outdoor shelter. It features a robust steel frame, a double-layered roof for ventilation, and removable mosquito netting.
Key Features:
- Sturdy Steel Frame: Powder-coated steel frame for rust resistance and durability. Features five supporting steel tubes and a sturdy beam structure.
- Thickened Leg Tubes: Each leg has a diameter of Φ80mm (3.1''), providing enhanced stability. Includes expansion bolts and stakes for secure ground attachment.
- Ventilated Double-Roof: Designed for improved air circulation and wind resistance. The top roof includes a mosquito net. A drain hole prevents water accumulation.
- Water and UV-Resistant Fabric: Made from 1500ml water-pressure waterproof polyester fabric, offering UPF 50+ UV protection and fade resistance.
- Removable Mosquito Netting: Zippered mesh netting with curtain rings for easy opening and closing, providing ventilation and protection from insects.

Figure 2.1: Gazebo dimensions and key features.

Figure 2.2: Detailed view of the gazebo's upgraded metal frame and roof design.

Figure 2.3: Components and features of the gazebo fabric and netting.
3. Packing List
Before assembly, verify that all parts listed below are included in your package. If any parts are missing or damaged, please contact customer support.

Figure 3.1: Contents of the COBIZI 12x20 Gazebo package.
- 2 x Canopy Tops
- 6 x Netting Walls
- 12 x Ground Nails
- 6 x Expansion Screws
- 1 x Frame (Includes various connecting rods, nuts, screws, 6 pairs of leg tubes, and 2 ceiling hooks)
- Other installation accessories (e.g., tools if provided)
4. Setup Instructions
Follow these steps carefully for proper assembly. It is recommended that 2 or more people assemble this gazebo.

Figure 4.1: Visual guide for gazebo assembly steps.
- Step 1: Assemble the Bottom Frame
Organize the corresponding numbered ribbed poles to form the bottom frame according to the provided instructions. Ensure all connections are secure. - Step 2: Assemble and Install the Top Frame
Follow the instructions to organize the corresponding numbered ribbed poles into the top frame. Install this assembled top frame onto the bottom frame. - Step 3: Attach Canopy Fabric and Leg Poles
First, place the top fabric onto the assembled top frame. Then, install the leg poles to raise the gazebo structure. - Step 4: Install Mosquito Netting
Use the included curtain rings to hang the mosquito netting around the perimeter of the gazebo.
Note: Assembly typically takes about 1 hour and requires 2 or more people.
5. Operating Instructions
Your COBIZI gazebo is designed for versatile use. Here are some tips for operation:
- Mosquito Netting: The zippered mesh netting can be easily opened or closed using the smooth double zippers. Use the portable straps to tie back the netting when not in use.
- Curtains: The gazebo includes curtains that can be drawn for privacy or tied back to allow an open view.
- Ceiling Hooks: Utilize the integrated metal hooks inside the gazebo to hang small items such as lamps or decorative lights.

Figure 5.1: Gazebo configurations for different weather and usage needs.
6. Maintenance
Proper maintenance will extend the life of your gazebo.
- Cleaning: Clean the canopy fabric and netting with mild soap and water. Rinse thoroughly and allow to air dry completely before storage. Do not use harsh chemicals or abrasive cleaners.
- Frame Care: Inspect the steel frame periodically for any signs of rust or damage. Touch up any scratches with rust-inhibiting paint to prevent corrosion. Ensure all bolts and connections remain tight.
- Weather Protection: While the canopy is water-resistant, it is not fully waterproof. In anticipation of heavy rain, strong winds, or snow, it is advisable to remove the canopy fabric and netting to prevent damage to the structure and fabric.
- Storage: When not in use for extended periods, especially during off-season, disassemble the gazebo and store all components in a dry, protected area to prevent wear and tear.
7. Troubleshooting
If you encounter issues with your gazebo, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Gazebo feels unstable or wobbly. | Improper anchoring; loose connections; uneven ground. | Ensure all leg poles are securely anchored with stakes and expansion bolts. Check and tighten all frame connections. Relocate to a level surface if necessary. |
| Water pooling on the roof. | Heavy rainfall exceeding drainage capacity; fabric sagging. | The roof has a drain hole to prevent pooling. If pooling occurs, gently push up from underneath to release water. Consider removing the canopy in very heavy rain. Ensure fabric is taut during assembly. |
| Mosquito netting not closing properly. | Zipper misalignment; fabric obstruction. | Ensure the netting is properly aligned on its curtain rings. Clear any fabric obstructions from the zipper path. |
| Difficulty with assembly. | Incorrect part orientation; insufficient personnel. | Refer to the numbered diagrams and ensure parts are oriented correctly. Ensure at least two people are assisting with assembly. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | COBIZI |
| Model Number | Heavy Duty Gazebo |
| Dimensions (L x W x H) | 11.81"L x 15.75"W x 65.75"H (Note: Product title indicates 12x20 ft, this specification might be for packaging or a component) |
| Size | 12X20 with Nettings (Flat Top) |
| Coverage | 240 square feet |
| Occupancy | 16-18 people |
| Frame Material | Reinforced Metal (Steel with powder-coating) |
| Canopy Material | 1500ml water-pressure waterproof polyester fabric |
| UV Protection | UPF50+ |
| Water Resistance Level | Not Water Resistant (Note: Product description states 'water-pressure waterproof polyester fabric' but spec says 'Not Water Resistant'. Treat as water-resistant for light rain, but not fully waterproof.) |
| Item Weight | 123.5 Pounds |
| Required Assembly | Yes |
9. Warranty and Support
COBIZI stands behind the quality of its products. For specific warranty information, please refer to the warranty card included with your purchase or contact COBIZI customer support directly.
If you have any questions, require assistance with assembly, or need to report missing/damaged parts, please contact our customer support team:
- Website: Visit the official COBIZI website for support resources.
- Email: Refer to your purchase documentation for customer service email.
- Phone: Refer to your purchase documentation for customer service phone number.
Please have your model number (Heavy Duty Gazebo) and purchase date available when contacting support.