Shark HD642

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Shark FlexFusion HD642 Ceramic Air Styler User Manual

Model: HD642

Introduction

Welcome to the Shark FlexFusion Ceramic Air Styler. This all-in-one styling system is designed to provide versatile styling options for curly and coily hair types, utilizing FlexFusion Style-Safe Technology to minimize heat damage. This manual provides essential information for safe operation, setup, use, and maintenance of your device.

Shark FlexFusion Ceramic Air Styler main unit with various attachments

Image: The Shark FlexFusion Ceramic Air Styler with its included attachments.

Important Safety Information

Please read all instructions carefully before using the Shark FlexFusion Ceramic Air Styler. Failure to follow these instructions may result in electric shock, fire, or serious injury.

  • Always ensure the device is unplugged when not in use or before cleaning.
  • Do not use near water or while bathing.
  • Keep out of reach of children.
  • Avoid using the hair dryer on the highest heat setting for extended periods to prevent heat damage to hair and scalp.
  • Do not operate with a damaged cord or plug.
  • Do not block air openings or place on a soft surface where openings may be blocked.

What's in the Box

Your Shark FlexFusion HD642 package includes the following components:

  • Shark FlexFusion Main Unit
  • Wet-or-Dry Fusion Brush
  • 2 x 1.25" Auto-Wrap Curlers
  • Curl-Defining Diffuser
  • FrizzFighter Finishing Tool
Contents of the Shark FlexFusion box, showing the main unit, Wet-or-Dry Fusion Brush, 1.25 inch Auto-Wrap Curlers, Curl-Defining Diffuser, and FrizzFighter Finishing Tool.

Image: All components included with your Shark FlexFusion system.

Setup

  1. Unpack: Carefully remove all components from the packaging.
  2. Inspect: Check the main unit and all attachments for any signs of damage. Do not use if damaged.
  3. Attach Accessories: To attach an accessory, align the accessory with the main unit and push firmly until it clicks into place. Ensure it is securely fastened before use.
  4. Remove Accessories: To remove an accessory, hold the main unit firmly and pull the accessory straight off.

Operating Instructions

The Shark FlexFusion offers multiple heat and airflow settings for customized styling. Always start with lower settings and adjust as needed for your hair type and desired style.

General Operation

  • Power On/Off: Press the power button to turn the device on or off.
  • Temperature Settings: Use the temperature control button to cycle through heat settings (e.g., Low, Medium, High, Cool Shot).
  • Airflow Settings: Use the airflow control button to adjust the fan speed.
  • Cool Shot: Press and hold the cool shot button for a burst of cool air to set your style.

Using the Wet-or-Dry Fusion Brush

This brush is designed for both drying and styling, providing volume, shine, and reduced frizz on wet or dry hair.

Close-up of the Wet-or-Dry Fusion Brush attachment, highlighting its bristles and ceramic heating elements.

Image: The Wet-or-Dry Fusion Brush attachment.

  1. Attach the Wet-or-Dry Fusion Brush to the main unit.
  2. For wet hair, towel-dry hair to remove excess water. For dry hair, ensure it is detangled.
  3. Section your hair.
  4. Place the brush near the roots and slowly glide it down to the ends, rotating slightly for added volume.
  5. Repeat until desired style is achieved.
Before and after image of a woman with blonde hair, showing her hair styled smooth and voluminous using the Wet-or-Dry Fusion Brush.

Image: Hair styled using the Wet-or-Dry Fusion Brush.

Using the 1.25" Auto-Wrap Curlers

These curlers use Coanda technology to automatically wrap hair, creating curls without extreme heat.

  1. Attach one 1.25" Auto-Wrap Curler to the main unit. Ensure hair is damp or dry.
  2. Take a section of hair and hold the curler near the ends. The air will automatically wrap the hair around the barrel.
  3. Hold for a few seconds, then use the cool shot to set the curl.
  4. Release the curl and repeat for all sections. Use the second curler for curls in the opposite direction.
Before and after image of a woman with wavy grey hair, showing her hair styled into soft curls using the 1.25 inch Auto-Wrap Curlers.

Image: Hair styled using the 1.25" Auto-Wrap Curlers.

Using the Curl-Defining Diffuser

The diffuser is designed to enhance natural curls and coils, adding definition and volume.

  1. Attach the Curl-Defining Diffuser to the main unit.
  2. Apply your preferred curl-enhancing product to damp hair.
  3. Gently place sections of hair into the diffuser bowl, lifting towards the scalp.
  4. Use a low heat and low airflow setting to dry hair, minimizing frizz and maximizing curl definition.
Before and after image of a woman with curly brown hair, showing her hair with enhanced, defined curls using the Curl-Defining Diffuser.

Image: Hair styled using the Curl-Defining Diffuser.

Using the FrizzFighter Finishing Tool

This tool helps to smooth frizz and flyaways for a polished, high-gloss finish on dry hair.

Close-up of the FrizzFighter Finishing Tool attachment.

Image: The FrizzFighter Finishing Tool attachment.

  1. Attach the FrizzFighter Finishing Tool to the main unit. Ensure hair is completely dry.
  2. Take small sections of hair.
  3. Gently glide the tool over the surface of your hair to smooth down frizz and add shine.

Activating Scalp Shield Mode

Scalp Shield Mode automatically adjusts temperature to protect your scalp from extreme heat during wet-to-dry styling, promoting healthier hair growth.

A woman using the Shark FlexFusion with a blue light indicating Scalp Shield mode is active, protecting her scalp.

Image: Demonstrating the Scalp Shield Mode in use.

  1. Turn on the Shark FlexFusion.
  2. Locate the Scalp Shield button on the handle (refer to the device diagram if available).
  3. Press the button to activate Scalp Shield Mode. An indicator light will illuminate.
  4. Proceed with your styling. The device will automatically regulate the temperature for scalp protection.

Maintenance

Regular cleaning ensures optimal performance and extends the life of your Shark FlexFusion.

  1. Unplug: Always unplug the device from the power outlet before cleaning.
  2. Cool Down: Allow the device and attachments to cool completely before handling.
  3. Clean Exterior: Wipe the main unit and attachments with a soft, damp cloth. Do not use abrasive cleaners or solvents.
  4. Clean Air Inlet Filter: Periodically check and clean the air inlet filter at the bottom of the main unit to prevent blockages. Remove any dust or hair buildup.
  5. Store: Store the device and its attachments in a cool, dry place.

Troubleshooting

Problem Possible Cause Solution
Device does not turn on. Not plugged in; power outlet issue; device malfunction. Ensure the power cord is securely plugged into a working outlet. Test the outlet with another device. If the problem persists, contact customer support.
Low airflow or overheating. Air inlet filter is blocked; internal blockage. Unplug the device and allow it to cool. Clean the air inlet filter. Ensure no hair or debris is blocking the air vents.
Attachments not staying on. Attachment not fully engaged; worn locking mechanism. Ensure the attachment is pushed firmly until it clicks into place. If the issue continues, the attachment or main unit may be damaged.
Hair not curling with Auto-Wrap Curlers. Hair section too large; hair too wet/dry; incorrect technique. Use smaller, detangled sections of hair. Ensure hair is damp for best results, or dry if preferred. Hold the curler closer to the hair ends to initiate wrapping.

Specifications

  • Model Name: FlexFusion Air + Ceramic Styling & Drying System
  • Model Number: HD642
  • Brand: Shark
  • Color: Metallic Mist
  • Hair Type: Curly & Coily Hair
  • Wattage: 1500 watts
  • Power Source: Corded Electric
  • Number of Speeds: 8
  • Number of Settings: 8
  • Material Type: Ceramic, Plastic
  • Item Weight: 1.7 pounds
  • Product Dimensions (D x W x H): 1.69" x 1.61" x 10.79"
  • Included Components: 2 x 1.25" Auto-Wrap Curlers, Curl-Defining Diffuser, FlexFusion, FrizzFighter Finishing Tool, Wet or Dry Fusion Brush
  • Special Features: Compact, Cool Shot Button, Lightweight, Portable, Style-Safe Technology, Scalp Shield Mode

Product Overview Video

Watch this official video from SharkNinja for a quick overview of the Shark FlexFusion system and its capabilities.

Video: An official demonstration of the Shark FlexFusion + Straight Ceramic Styling & Drying System by SharkNinja.

Warranty and Support

For warranty information, please refer to the warranty card included with your product or visit the official Shark website. For technical support, replacement parts, or service, please contact Shark Customer Service.

Online Support: www.sharkclean.com/support/

Phone Support: Refer to your product packaging or the official website for the most current contact numbers.

© 2026 SharkNinja Operating LLC. All rights reserved.

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